The Ultimate Guide To Tanner Buchanan's Girlfriend: From Childhood Sweetheart To Cobra Kai Co-Star Fiancée

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The question of "Who is Tanner Buchanan's girlfriend?" has finally been answered with a massive, exclusive update. After years of intense speculation, a highly private dating life, and a complex on-screen love triangle in Cobra Kai, the actor has confirmed a major, life-changing relationship status change in early 2025. This article provides the ultimate, up-to-date look at the star's love life, confirming his current fiancée and detailing his complete dating history, including his long-term romance with a childhood sweetheart and the truth behind his viral kiss with Addison Rae.

The latest news, confirmed in February 2025, reveals that the actor is officially engaged to his co-star, shocking fans who believed he was still dating his on-again, off-again girlfriend, Lizze Broadway. The star, best known for his intense role as Robby Keene, has successfully kept his most significant relationship a secret for years, proving that sometimes, the best on-screen chemistry is based on a real-life connection.

Tanner Buchanan: Full Biography and Profile

Tanner Emmanuel Buchanan is an American actor who has risen to international fame for his dynamic and complex roles in both television and film. His career trajectory has cemented him as one of Hollywood's most promising young stars, particularly within the Netflix ecosystem.

  • Full Name: Tanner Emmanuel Buchanan
  • Date of Birth: December 8, 1998
  • Age (as of December 2025): 27
  • Birthplace: Lima, Ohio, USA
  • Hometown: Lima, Ohio
  • Occupation: Actor, Dancer, Model
  • Years Active: 2010–Present
  • Breakout Role: Leo Kirkman in the ABC/Netflix political drama Designated Survivor (2016–2019)
  • Most Famous Role: Robby Keene in the Netflix series Cobra Kai (2018–Present)
  • Notable Film Roles: Cameron Kweller in the Netflix romantic comedy He's All That (2021)
  • Early Career: Started with guest roles on shows like Modern Family (2010), Grey's Anatomy, and Major Crimes.

The Shocking Truth: Tanner Buchanan's Current Girlfriend is His Fiancée

For years, the identity of Tanner Buchanan's true love has been a hot topic among fans of the Karate Kid universe. While his character, Robby Keene, was entangled in a dramatic love triangle with Miguel Diaz and Samantha LaRusso, the actor himself was quietly nurturing a relationship that has now led to an engagement.

It's Mary Mouser: The Real-Life Samantha LaRusso

As of February 2025, Tanner Buchanan is officially engaged to his long-time girlfriend and Cobra Kai co-star, Mary Mouser. The couple, who portray the on-screen ex-lovers Robby Keene and Samantha LaRusso, made the surprise announcement at the series finale event for *Cobra Kai* Season 6.

Their relationship timeline is a testament to privacy and a friendship that blossomed into romance. They first met in 2017 while filming the first season of the hit Netflix show.

  • Met: 2017, on the set of Cobra Kai.
  • Relationship Confirmation: The couple had been extremely private, with their relationship only being confirmed publicly alongside their engagement announcement in early 2025.
  • The Big News: The engagement was announced in a joint Instagram post, sharing their happiness and revealing a relationship that had been kept out of the public eye for years.

This news resolves years of speculation about their intense on-screen chemistry, which many fans suspected was rooted in a deeper, real-life connection. The engagement between Robby Keene and Samantha LaRusso's actors is a fairy tale ending for the Miyagi-Do and Cobra Kai families.

Tanner Buchanan's Complete Dating History Timeline

Before his engagement to Mary Mouser, Tanner Buchanan's romantic life was primarily defined by two highly publicized connections: a serious, long-term relationship with another actress and a viral on-screen moment that confused the public.

1. Lizze Broadway: The Childhood Sweetheart (2017–2022)

For many years, the public knew Lizze Broadway as Tanner Buchanan's long-term girlfriend. Their history was extensive, as the two had been dating since their teenage years, long before Buchanan became a household name as Robby Keene.

Lizze Broadway is an actress famous for her roles in series like The Rookie and Splitting Up Together. The couple was known for being candid about the ups and downs of dating since high school, including a brief split during their teenage years, which Buchanan admitted was his fault.

  • Relationship Status: On-again, off-again long-term relationship.
  • Timeline: Started in their teenage years, lasting until around 2021 or 2022.
  • Breakup Details: While the couple kept their private life guarded, their relationship appeared to end around 2021/2022, with reports confirming the split. This was around the time Broadway reportedly unfollowed Buchanan on social media.

The longevity of their relationship, spanning his rise to fame with Designated Survivor and the early seasons of Cobra Kai, made their eventual separation a significant talking point among fans.

2. Addison Rae: The Viral Kiss Context (2021)

The most confusing moment in Tanner Buchanan’s dating history for the casual fan was his intense, on-stage kiss with TikTok superstar Addison Rae. This moment, which occurred at the 2021 MTV Movie & TV Awards, immediately sparked rumors that Addison Rae was his new girlfriend.

The Reality: The kiss was purely professional. The two were co-stars promoting their Netflix film, He's All That, a gender-flipped remake of the classic 1999 movie. They won the award for "Best Kiss," and their acceptance speech involved recreating the moment live on stage.

Despite the steamy nature of the kiss, there was no real-life romance between Tanner Buchanan and Addison Rae. Addison Rae was dating Omer Fedi at the time, and Buchanan was still believed to be in his relationship with Lizze Broadway, making the viral moment a masterclass in movie promotion.

The Future: Robby Keene and Samantha LaRusso's Real-Life Happily Ever After

The engagement between Tanner Buchanan and Mary Mouser marks a beautiful convergence of their professional and personal lives. Their ability to keep their romance a secret while working so closely together on a high-profile show like Cobra Kai is remarkable, given the intense media scrutiny on the cast.

Their relationship timeline, starting as a friendship on the set of the show that launched them to global stardom, mirrors the kind of wholesome, long-term connection that fans often hope for their favorite stars. As *Cobra Kai* wraps up its final season, the couple is now preparing for a new chapter: marriage.

The news has generated a massive wave of support from the fan base, who see the union of the actors behind Robby Keene and Samantha LaRusso as a perfect blend of the show's legacy and real-life romance. This engagement officially closes the book on the long-standing "Tanner Buchanan girlfriend" speculation, replacing it with the exciting title of "Tanner Buchanan's fiancée," Mary Mouser. They are a true power couple in the new generation of Hollywood talent.

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