Mary Mouser's Real-Life Engagement: 5 Shocking Facts About Her Relationship Status—Is She Married?

The question "Who is Mary Mouser's husband?" has been a top search query for years, especially as the *Cobra Kai* star's fame skyrocketed. As of December 2025, the definitive answer is that Mary Mouser is *not* married and therefore does not have a husband. However, that answer comes with a massive, headline-making twist: after years of speculation and a well-documented long-term relationship, the actress is now officially engaged to her on-screen co-star, Tanner Buchanan. This surprise announcement has completely redefined her relationship status, moving her from a long-term girlfriend to a soon-to-be bride, leaving fans of the *Karate Kid* universe reeling with excitement.

Mary Mouser: Biography and Profile Overview

Mary Matilyn Mouser is an American actress who began her career at a young age, quickly establishing herself in film and television roles. Her breakout role as Samantha "Sam" LaRusso in the Netflix series *Cobra Kai* cemented her status as a global star. Her work on the show, which is a continuation of the iconic *Karate Kid* film series, has earned her critical acclaim and a massive, dedicated following.

• Full Name: Mary Matilyn Mouser
• Date of Birth: May 9, 1996
• Age (as of 2025): 29
• Place of Birth: Pine Bluff, Arkansas, USA
• Height: Approximately 5 ft 3 in (160 cm)
• Occupation: Actress, Voice Artist
• Best Known For: Samantha "Sam" LaRusso in *Cobra Kai* (2018–Present)
• Notable Works: *Body of Proof*, *Freakish*, *NCIS*, *The Fosters*
• Current Relationship Status: Engaged to Tanner Buchanan (as of 2025)
• Health Advocacy: She has been open about her diagnosis with Type 1 Diabetes.

The Shocking Truth: Why Mary Mouser Does Not Have a Husband (Yet)

For years, Mary Mouser's relationship status was one of the most stable and public-facing in Hollywood. She was in a committed, long-term relationship with fellow actor Brett Pierce for nearly a decade. This commitment led many fans and media outlets to frequently speculate about a potential engagement or marriage, which is why the search query "Mary Mouser husband" became so popular.

The truth is that Mary Mouser has never been married. Her romantic life was centered on her partnership with Brett Pierce, a relationship that began in December 2015. The couple was known for sharing sweet moments and milestones on social media, making them a fan-favorite celebrity pairing. However, as of recent updates in 2024, reports emerged indicating that the long-term relationship between Mouser and Pierce had quietly come to an end.

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This breakup, though initially private, paved the way for the shocking news that would dominate entertainment headlines in 2025. The end of her relationship with Brett Pierce was the final chapter before her life took a dramatic, unexpected turn with a new, very familiar partner.

The Brett Pierce Chapter: A Long-Term Partnership

Mary Mouser and Brett Pierce, an actor known for roles in *The Family Business* and *A Million Little Things*, were together for over eight years. Their relationship was a testament to stability in the often-turbulent world of young Hollywood. They celebrated anniversaries, traveled together, and supported each other's careers, with Pierce often attending *Cobra Kai* events alongside Mouser.

The longevity of their relationship fueled the persistent belief that marriage was imminent. The eventual split, details of which remain largely private, marked the end of an era for the actress and her followers. This transition is a key piece of the puzzle, as it directly precedes the new, high-profile relationship that has captivated the public.

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The Mega-Twist: Engaged to Her Cobra Kai Co-Star, Tanner Buchanan

The biggest and freshest piece of news regarding Mary Mouser’s romantic life is her surprise engagement to her *Cobra Kai* co-star, Tanner Buchanan. The announcement, which came via a joint Instagram post in 2025, confirmed not only that they were dating but that they were already engaged to be married.

This revelation sent shockwaves through the fandom, primarily because of the on-screen dynamic between their characters. Mouser plays Samantha "Sam" LaRusso, the daughter of Daniel LaRusso, and Buchanan plays Robby Keene, the son of Johnny Lawrence. Their characters have a complex, often tumultuous romantic history on the show, which has led to intense fan speculation about their real-life chemistry for years. However, the actors consistently maintained that they were just friends, with Mouser being in her relationship with Brett Pierce and Buchanan previously linked to actress Lizzie Broadway.

The engagement news is a real-life fulfillment of a fan-fiction dream, where the on-screen tension between Sam LaRusso and Robby Keene has blossomed into a real-life lifelong commitment. This unexpected turn is the ultimate answer to the "Mary Mouser husband" query: she is not married, but she has found her future husband in a place no one truly expected—the halls of the Miyagi-Do and Cobra Kai dojos.

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The Real-Life Sam and Robby: A Timeline of the Surprise Engagement

While the exact details of when Mary Mouser and Tanner Buchanan transitioned from friends to romantic partners remain private, the public timeline is clear and dramatic:

1. Long-Term Friendship: For years, Mouser and Buchanan worked closely together on the set of *Cobra Kai*, often participating in joint interviews and promotional events. They consistently emphasized their close, platonic friendship.
2. 2024 Breakup: Mary Mouser's long-term relationship with Brett Pierce reportedly concludes, marking a major change in her personal life.
3. 2025 Engagement Announcement: In a stunning joint social media post, the *Cobra Kai* stars announce that they are not only a couple but are also engaged to be married. The news broke just as the final season of the series was highly anticipated, adding a layer of meta-excitement to the show’s conclusion.

The engagement highlights a growing trend of co-stars finding love on set, and for Mary Mouser, it means her next major life announcement will be about her wedding, finally giving a definitive answer to the question of who her husband is. The relationship is a beautiful and unexpected continuation of the *Cobra Kai* legacy, proving that sometimes, the greatest love stories are the ones you never see coming.

Topical Authority: Mary Mouser's Impact Beyond Relationships

While her engagement is the current headline, Mary Mouser's career and personal advocacy are equally compelling, adding depth to her public persona. Her role as Sam LaRusso has made her a central figure in one of Netflix’s most successful series, showcasing her talent for blending action, drama, and emotional vulnerability. Her character's journey through trauma, rivalry, and self-discovery resonates deeply with audiences.

Furthermore, Mouser has been a powerful advocate for Type 1 Diabetes awareness, using her platform to share her personal journey with the chronic condition. This level of openness and commitment to health advocacy makes her a role model for many fans. Her dedication to her craft and her willingness to be vulnerable about her life experiences demonstrate a maturity that goes beyond her on-screen roles. This combination of professional success and personal integrity is why she remains one of the most searched-for young actresses in the industry.