The $87 Million Love Story: 5 Surprising Facts About Isaiah Hartenstein’s Wife, Kourtney Kellar
The landscape of the NBA has shifted for Isaiah Hartenstein, and his personal life is just as dynamic. As of late 2025, the German-American center is now a cornerstone for the Oklahoma City Thunder (OKC), having signed a massive contract that cemented his status as a top-tier player. However, behind the headlines of his $87 million deal and on-court success is a compelling love story with his wife, Kourtney Kellar Hartenstein, a successful model and social media personality whose journey is anything but conventional.
This article dives deep into the life of Kourtney Hartenstein, exploring her career, their unique relationship timeline, and the significant milestones they’ve shared, including their 2023 wedding and the recent arrival of their first child. The couple’s move from the bustling New York Knicks market to Oklahoma City is the latest chapter in a life built on a simple Instagram direct message (DM).
Kourtney Kellar Hartenstein: Complete Biography & Profile
Kourtney Kellar Hartenstein is an American model, social media influencer, and former ring girl who gained significant public attention following her relationship and marriage to NBA star Isaiah Hartenstein. Her career spans high-profile modeling gigs and a thriving online presence.
- Full Name: Kourtney Kellar Hartenstein (née Kellar)
- Date of Birth: Exact date not widely publicized, but she is an American model and influencer.
- Place of Birth: Texas, USA
- Nationality: American
- Spouse: Isaiah Hartenstein (married July 2023)
- Children: One son (born May 2024)
- Profession: Professional Model, Social Media Influencer, Former Ring Girl
- Education: Holds a Bachelor of Science in Athletic Training.
- Notable Career Highlights: Appeared on the cover of Maxim Magazine, worked as a ring girl for major boxing and MMA fights, and maintains a large following on platforms like Instagram and TikTok.
- How They Met: Isaiah Hartenstein "slid into her DMs" on Instagram in 2019.
- Current Residence: Oklahoma City, Oklahoma (following Isaiah's signing with the OKC Thunder)
The Unexpected Start: From Instagram DM to NBA Power Couple
The foundation of Isaiah and Kourtney’s relationship is a modern-day fairytale, proving that sometimes, the simplest gestures can lead to the biggest life changes. Their initial connection in 2019 began not on a lavish date, but with a direct message on Instagram, a detail that Kourtney has often shared with her followers.
They officially started dating in February 2019, establishing a strong bond despite the demanding schedules of an emerging NBA player and a professional model.
A Timeline of Milestones
The couple moved quickly from dating to solidifying their future, marking several major milestones in a short period:
- 2019: Isaiah Hartenstein, then playing for the Houston Rockets, slides into Kourtney Kellar’s DMs. They begin dating in February.
- April 2022: Isaiah proposes, and the couple gets engaged. At the time, Hartenstein was playing for the Los Angeles Clippers.
- July 2023: The couple ties the knot in a beautiful ceremony. The nuptials took place on the City Cruises Endless Dreams Yacht in Newport Beach, California, a stunning setting for their wedding.
- May 2024: Kourtney and Isaiah welcome their first child, a baby boy, just before the NBA offseason.
- July 2024: Hartenstein signs a blockbuster three-year, $87 million contract with the Oklahoma City Thunder (OKC), prompting a significant move from their previous home in New York.
The transition from the New York Knicks, where Hartenstein had a breakout season and became a fan favorite, to the Oklahoma City Thunder marked a major career and life change, with Kourtney publicly supporting the move and embracing the new chapter in the Midwest.
Kourtney’s Career: More Than Just an NBA Wife
While Kourtney Kellar Hartenstein is now widely known as Isaiah Hartenstein’s wife, her professional career is impressive in its own right and showcases her versatility and drive. She built a successful career in the competitive world of modeling and entertainment long before her NBA connection.
Modeling and Media Presence
Kourtney is a recognized fashion and lingerie model, having appeared on the cover of high-profile publications, including the internationally known Maxim Magazine. Her striking looks and confident presence led to a significant following, which she has leveraged into a strong social media brand. She has nearly 700,000 followers on Instagram and a substantial following on TikTok, establishing her as a genuine social media influencer.
A unique aspect of her career is her work as a ring girl, a role she has performed for multiple legendary boxing and MMA fights. This visibility in the sports and entertainment world cemented her status as a public figure.
Beyond the glamour, Kourtney also holds a Bachelor of Science in Athletic Training, and her background includes work as a college cheerleader and a gymnastics coach, demonstrating her deep connection to athletics and fitness—a perfect complement to her husband's profession.
Isaiah Hartenstein’s Financial Leap and OKC Future
The couple’s life took a monumental turn in July 2024 when Isaiah Hartenstein signed a lucrative deal with the Oklahoma City Thunder. After a standout run with the New York Knicks that saw him become a defensive anchor, Hartenstein’s market value soared.
The $87 Million Contract
Hartenstein’s contract with the OKC Thunder is a three-year, $87 million agreement, with his 2025-26 base salary set at a staggering $28.5 million. This financial leap is a testament to his hard work in the league, having previously played for teams like the Houston Rockets, Denver Nuggets, Cleveland Cavaliers, and the LA Clippers before his successful stint with the Knicks.
This massive contract significantly impacts the couple’s financial standing, with Isaiah Hartenstein’s estimated net worth in 2025 believed to be around $22.6 million, a figure largely driven by his NBA earnings and growing endorsement portfolio.
The Family Man and the Thunder
With the birth of their son in May 2024, Isaiah and Kourtney have fully embraced their roles as parents. Kourtney often shares glimpses of their family life, balancing the demands of a high-profile modeling career and supporting an NBA center. The move to Oklahoma City signifies a new phase for the Hartenstein family, where Isaiah is expected to play a crucial role for the young and talented Thunder squad alongside stars like Shai Gilgeous-Alexander.
The couple’s public support for one another, from Kourtney attending his first Thunder games to Isaiah celebrating her career achievements, highlights a strong, unified front as they navigate the exciting, high-stakes world of professional basketball and parenthood. The Hartenstein family is clearly ready for the next chapter of their journey in Oklahoma.
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