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The Scientist Who Stole His Heart: Everything To Know About Young Thug’s Fiancée, Mariah The Scientist

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The question of "Who is Young Thug's girlfriend?" has finally been answered with a stunning, permanent update. As of late December 2025, the rapper, whose legal name is Jeffery Lamar Williams, is officially engaged to his longtime partner, the contemporary R&B singer known professionally as Mariah the Scientist. This major relationship milestone—a surprise onstage proposal—has cemented her status as the most significant woman in his life following his highly publicized, decade-long on-again, off-again relationship with ex-fiancée Jerrika Karlae. The focus now shifts entirely to Mariah Amani Buckles, the Atlanta native who has captured the heart of one of rap's most enigmatic figures.

The engagement news is the freshest and most crucial development, confirming that the relationship between the YSL founder and the R&B songstress is stronger than ever. Their romance has blossomed in the public eye, even as Young Thug faces the complexities of his ongoing legal battles. This article dives deep into the woman who is now Young Thug's fiancée, exploring her background, her career, and the intimate details of their unique relationship timeline.

Mariah the Scientist: Complete Biography and Profile

Mariah Amani Buckles, known by her distinctive stage name Mariah the Scientist, is a rising star in the R&B world whose life trajectory is as unique as her music. Her moniker isn't just a gimmick; it's a nod to her serious academic background before she fully committed to a music career.

  • Full Name: Mariah Amani Buckles
  • Stage Name: Mariah the Scientist
  • Date of Birth: October 27, 1997
  • Age: 28 (as of late 2025)
  • Birthplace: Atlanta, Georgia, U.S.
  • Occupation: Singer-Songwriter, Contemporary R&B Artist
  • Education: Attended St. John's University in New York on a full scholarship to study biology, which inspired her stage name. She dropped out to pursue music.
  • Career Highlights: Signed to RCA Records; known for her debut EP To Die For (2018), her debut album Master (2019), and her 2021 album Ry Ry World. She has collaborated with artists like Lil Yachty and Young Thug.
  • Zodiac Sign: Scorpio

The Surprise Engagement: Young Thug and Mariah The Scientist Are Officially Engaged

The most recent and electrifying news surrounding Young Thug’s personal life is his engagement to Mariah the Scientist. The proposal was a grand, public affair that took place on December 16, 2025, during his "Hometown Hero: Young Thug & Friends - A Benefit Concert" at the State Farm Arena in Atlanta, Georgia.

The rapper got down on one knee in front of a massive crowd, presenting the R&B singer with a dazzling engagement ring. Mariah the Scientist, visibly emotional, accepted the proposal, confirming the news on her social media shortly after. This public display of affection and commitment came as a beautiful surprise to fans, especially given the intense media scrutiny surrounding Young Thug's ongoing YSL RICO trial.

The relationship between Jeffery Lamar Williams and Mariah Amani Buckles has been a source of fascination for years, evolving from a professional collaboration to a serious, committed romance. Their engagement signifies a new, hopeful chapter for the couple, demonstrating a powerful bond that transcends the pressures of fame and legal challenges. Her consistent presence and support throughout his trial have been a quiet testament to her unwavering loyalty, making the engagement an emotional payoff for their fans.

A Timeline of Love: From Collaborators to Fiancés

Young Thug and Mariah the Scientist’s relationship is characterized by a blend of creative synergy and personal connection. Their journey began to take shape around 2021, following the definitive end of Young Thug’s long-term relationship with Jerrika Karlae.

The Musical Connection: Collaborations That Sparked Romance

The couple first connected through their shared profession, music. Their creative chemistry quickly became apparent through their joint projects. A significant moment in their early public relationship was the release of twin singles, "From A Man" and "From A Woman," which offered two perspectives on the same subject, effectively putting their love life on wax. The tracks, released in late 2023, were a clear indication of their deep, intertwined personal and professional lives. Mariah also featured on the track "Walked In" by Young Thug, further solidifying their artistic partnership.

Public Support and Trial Presence

Their bond was tested and ultimately strengthened during Young Thug's highly publicized legal proceedings. Mariah the Scientist's presence in the courtroom during the YSL RICO trial has been a consistent and powerful demonstration of her commitment. She has been a pillar of support, even sending him loving messages during court dismissals, which were reported widely by media outlets.

This period cemented her role not just as his girlfriend, but as his dedicated partner. The engagement, coming on the heels of such a challenging time, symbolizes their resilience and dedication to building a future together despite the circumstances.

The Legacy of Past Relationships: Jerrika Karlae and Other Partners

To fully understand the significance of Young Thug's engagement to Mariah the Scientist, it is essential to look at his past, most notably his long-term relationship with Jerrika Karlae. This relationship dominated his personal life for nearly a decade and was a constant topic of public discussion.

The Jerrika Karlae Era: A Decade-Long Saga

Jerrika Karlae was Young Thug's on-again, off-again girlfriend and fiancée for a significant portion of his career.

  • Relationship Timeline: They began dating around 2013/2014 and were engaged for two years after a proposal in April 2015.
  • The Breakup: The relationship was known for its tumultuous nature, including public arguments and accusations of infidelity. Their romantic involvement definitively ended sometime around 2021, which is when Young Thug began dating Mariah the Scientist.
  • Current Status: Despite the breakup, Karlae has occasionally spoken positively about Young Thug, offering updates on his well-being during his incarceration, indicating a level of continued respect.

Other Notable Relationships

Young Thug also has a complex history with other women, including having several children with multiple partners. His dating history includes:

  • LaKevia Jackson: The mother of one of his children, who tragically passed away in 2022.
  • Amy Luciani: Another partner mentioned in his dating history.

The current chapter with Mariah the Scientist represents a clear shift. Unlike the often-dramatic public narrative of his past, his relationship with Mariah has been portrayed as a more mature, supportive, and creatively aligned partnership, culminating in the recent, joyous engagement. The R&B singer, who transitioned from a biology student to a celebrated artist, is now poised to become Mrs. Jeffery Lamar Williams, marking an exciting new era for the "Go Crazy" rapper.

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