Mckenna Grace Boyfriend: What to Know About Mason Thames and Their Relationship Rumors

Mckenna Grace and Mason Thames have become one of the most talked-about young Hollywood pairings after their on-screen romance in Regretting You appeared to spill into their real lives.

The two actors play love interests Clara and Miller in the film adaptation of Colleen Hoover’s novel, but fans began wondering if their connection went beyond acting after they started spending more time together away from the set.

Grace and Thames have been photographed together, attended events side by side, held hands in public and shared playful social media posts. They have also spoken warmly about each other in interviews, with Thames calling Grace one of the most driven people he has ever met and Grace describing him as her “favorite person.”

Still, the two have not publicly confirmed that they are officially dating. Much of the interest surrounding their relationship comes from their public appearances, social media activity and the natural chemistry they developed while working together.

Their story started before filming Regretting You and became even more interesting when they discovered they would be working together on another movie, New Year’s Rev.

Here is everything to know about Mckenna Grace and Mason Thames, their friendship, the romance rumors and their growing professional connection.

Who Is Mckenna Grace?

Mckenna Grace is an American actress who began working professionally at a young age.

She became known for roles in movies and television shows and has continued taking on more mature projects as her career has developed.

One of her most notable recent projects is Regretting You, where she plays Clara, a teenager who develops a romantic relationship with Miller, played by Mason Thames.

Grace has also pursued music and has spoken publicly about her creative interests beyond acting.

By the time she began filming Regretting You, she had already spent years working in the entertainment industry and had developed a reputation for taking her acting career seriously.

That work ethic is something Thames has repeatedly praised.

Who Is Mason Thames?

Mason Thames is an actor who rose to wider attention through film and television projects before taking on the role of Miller in Regretting You.

He plays the romantic lead opposite Grace, giving the two actors plenty of scenes together throughout the movie.

Thames also starred in the live-action version of How to Train Your Dragon, adding another major project to his growing career.

His work with Grace has attracted particular attention because their chemistry has been noticeable both on screen and during promotional appearances.

However, Thames has consistently described his connection with Grace in terms of friendship, respect and their ability to work well together, rather than publicly confirming a romantic relationship.

How Did Mckenna Grace and Mason Thames Meet?

Grace and Thames first met before filming Regretting You began.

According to Thames, their first meeting happened unexpectedly when they were both in an Uber.

The two were on their way to see Deadpool & Wolverine, and Thames said he expected the first meeting between two actors who would soon be playing romantic interests to potentially feel awkward.

Instead, they connected almost immediately.

Thames recalled that the experience was funny and comfortable rather than uncomfortable.

He said they “clicked immediately” and began spending a lot of time together after that first meeting.

That early connection became useful once cameras started rolling.

Playing a romantic couple can be challenging when actors are still getting to know each other, but Thames said his chemistry with Grace felt easy.

Their friendship therefore became part of what helped their performances feel natural.

Mckenna Grace and Mason Thames Played Love Interests

In Regretting You, Grace and Thames play Clara and Miller, two young characters whose relationship is central to the story.

The movie is based on Colleen Hoover’s novel of the same name.

Because their characters are romantically involved, the actors had to create believable chemistry on screen.

Thames later explained that they sometimes took creative liberties while filming their romantic scenes.

The pair even improvised several kisses.

One example involved a scene where Miller asks Clara to prom. Thames said they felt the moment naturally called for a kiss, so they included one during almost every take.

Interestingly, not all of those moments made it into the finished movie.

Grace laughed about the experience while discussing how they watched the movie and realized that some of the improvised moments had been left on the cutting-room floor.

Their Viral TikTok Sparked Romance Rumors

The romance rumors surrounding Grace and Thames really began gaining attention in 2025.

While filming Regretting You, the two appeared together in a TikTok video that quickly attracted fans.

In the video, they recreated a moment inspired by 500 Days of Summer. Both were dressed in character, and Thames grabbed Grace and kissed her out of frame.

Grace captioned the post with the names of their movie characters, “Miller & Clara,” which suggested that they were still playing their fictional roles.

Later, when Grace was asked about the video, she laughed and emphasized that they were in costume and in character.

Thames also explained that Grace had suggested making the TikTok.

The playful video nevertheless caused fans to wonder whether there might be something more happening between the two actors.

They Continued Spending Time Together

The speculation did not end with the TikTok.

Grace and Thames continued appearing together during the months surrounding the movie’s production and promotion.

They shared additional social media moments, attended events together and appeared increasingly comfortable around each other.

Grace posted videos showing Thames carrying her at one event, while another showed the two holding hands at a red carpet appearance.

There was also a video of Thames lifting Grace onto his shoulders.

None of these moments alone confirms a romantic relationship, but together they helped create the public impression that the two had become especially close.

Their own comments have generally focused on how much they enjoy spending time together.

Mckenna Grace and Mason Thames Were Seen Holding Hands in New York

One of the most talked-about moments came in June 2025, when Grace and Thames were photographed holding hands while walking through New York City.

The pair were seen together in the SoHo area.

They appeared relaxed as they walked around, and photographs showed them smiling and looking comfortable in each other’s company.

The outing naturally generated another wave of dating speculation.

However, neither actor publicly confirmed that they were officially a couple based on the photographs.

It is therefore more accurate to describe their relationship at that point as a close friendship with ongoing romance rumors rather than a confirmed relationship.

They Went to an Aquarium Together

Thames later offered another glimpse into how often he and Grace spent time together.

In an interview, he said the two “hang out, like, all the time.”

He described one outing to an aquarium.

According to Thames, Grace had an aquarium playlist in her AirPods and shared the experience with him while they walked around looking at the sharks.

It is a small detail, but it helped show the kind of ordinary activities the two enjoyed away from movie sets and red carpets.

Their relationship appeared to involve more than simply promoting Regretting You.

Mckenna Grace Was With Mason Thames for His 18th Birthday

When Thames turned 18 in July 2025, Grace was among the people celebrating with him.

Thames said he spent part of his birthday week at home in Texas and that Grace was there as well.

He described the celebration as relaxed and said he also spent time with family and close friends.

When asked about Grace getting along with his family and friends, Thames spoke very positively about her.

He said she was funny, kind and someone who fit in well with the people around him.

That comment further highlighted how close the two had become.

Still, he did not publicly label Grace as his girlfriend.

Mason Thames Praised Mckenna Grace’s Work Ethic

Thames has been especially complimentary when discussing Grace professionally.

He described her as a star and a “warrior,” saying he had never met someone with the same level of work ethic.

He also said watching her push herself motivated him to become better.

Thames called her an incredibly talented actress and said she was one of the most driven people he had ever met.

Those comments suggest that his admiration for Grace extends beyond their friendship and on-screen chemistry.

He has repeatedly spoken about how impressed he is by her dedication to acting.

Mckenna Grace Called Mason Thames Her “Favorite Person”

Grace has also spoken warmly about Thames.

When asked about the growing speculation surrounding their relationship, she did not provide a clear confirmation.

Instead, she said that she loved Mason and described him as her “favorite person.”

She also shared a fun detail about their friendship.

According to Grace, whenever they visited a new city together, she would make Thames go to an aquarium or zoo with her.

That comment gave fans another glimpse into their close bond without providing a definitive answer about whether they were romantically involved.

They Worked Together on Another Movie

Grace and Thames’ professional relationship did not stop with Regretting You.

The pair also worked together on New Year’s Rev, a music comedy connected to Green Day.

The movie follows three teenage musicians who embark on a road trip after believing they have landed an opportunity to open for the legendary band.

Interestingly, both actors discovered they had been cast in the project around the same time.

Thames was already working on How to Train Your Dragon when he learned about the Green Day movie.

He messaged Grace because he was excited about working with her on Regretting You.

Grace then responded about the Green Day movie, which initially confused Thames because he thought they were discussing a different project.

They eventually realized they had been cast together in two movies.

That meant they would work together on back-to-back productions.

Their Friendship Grew Before Both Movies

The fact that Grace and Thames knew they would be working together on multiple projects gave them plenty of time to develop their friendship.

Grace said they had months to hang out, mess around and simply spend time together before filming.

That familiarity likely helped their on-screen chemistry.

Instead of meeting for the first time immediately before filming a romantic movie, they had already built a comfortable relationship.

Thames has repeatedly said that this made working with Grace easier.

Their friendship allowed them to joke around and feel comfortable with each other, which eventually translated into the performances fans saw on screen.

Are Mckenna Grace and Mason Thames Dating?

Based on the details provided, Mckenna Grace and Mason Thames have not publicly confirmed that they are officially dating.

They have, however, sparked significant romance speculation.

The reasons include their viral kissing TikTok, public hand-holding, frequent appearances together, affectionate comments, shared outings and the amount of time they have spent together.

Thames has described Grace as someone he hangs out with frequently, while Grace has called him her favorite person.

Their chemistry is also obvious in Regretting You, where they play a young couple.

But on-screen chemistry and close friendship do not automatically mean that two actors are romantically involved in real life.

Until either Grace or Thames confirms their relationship status, it is best to describe them as close friends and co-stars who have been the subject of dating rumors.

Mckenna Grace and Mason Thames’ Relationship Timeline

September 2024: Grace and Thames were announced as the stars playing Clara and Miller in Regretting You.

Before filming in March 2025: The pair met for the first time in an Uber and quickly became friends.

Spring 2025: They filmed Regretting You and also worked on New Year’s Rev.

April 2025: A playful kissing TikTok sparked romance speculation.

June 2025: Grace and Thames were photographed holding hands in New York City.

July 2025: Grace spent part of Thames’ 18th birthday celebration with him in Texas.

October 2025: The pair continued appearing together during Regretting You promotions and premieres.

Throughout the period, both actors continued speaking positively about one another, while neither publicly confirmed that they were dating.

A Close Bond That Continues to Spark Questions

Mckenna Grace and Mason Thames have developed a friendship that has become difficult for fans to ignore.

They first connected in an Uber, quickly clicked and began spending time together. Their friendship then became part of their work as they played romantic characters in Regretting You.

The two later worked together on another movie, spent time together outside filming and appeared at events side by side.

Their playful social media videos and public hand-holding naturally fueled dating speculation.

At the same time, both actors have been careful about directly labeling their relationship.

For now, the clearest facts are that Grace and Thames are close friends and successful young co-stars who have developed strong chemistry both on and off screen. Whether that friendship has become a romantic relationship remains something they have not publicly confirmed in the information provided.

For fans searching for Mckenna Grace’s boyfriend, Mason Thames is the name most closely connected to the current rumors, but the two have not officially announced themselves as a couple. Their story continues to attract attention largely because of how naturally they seem to connect, both as actors and as friends.