Introduction
Isaiah Hartenstein wife is Kourtney Kellar, an American model born on March 8, 1991 in Argyle, Texas. Isaiah is a 7-foot center for the Oklahoma City Thunder. He was born in Eugene, Oregon, played in Germany and Lithuania as a teenager and young pro, and won an NBA championship in 2025.
Kourtney is far more than “the NBA player’s partner.” She is a working model, a former boxing ring girl, a business founder and a social media creator with hundreds of thousands of followers. The couple has been together since 2019, married in 2023 and now has a young son.
In this article, you will learn about her early life, education, career, and love story with Isaiah. You will also find their wedding details, family life, social media presence, a quick facts table and answers to the most common questions fans ask.
Who Is Kourtney Kellar, Isaiah Hartenstein’s Wife?
Kourtney Kellar is an American model and influencer. Most sources list her birthday as March 8, 1991, which makes her 35 years old today. Fan databases list Argyle, Texas as her birthplace. Major sports outlets simply say she was born in Texas and grew up in the Dallas area, so treat the exact town with a little caution.
She was the youngest of three kids. Basketball was part of her life early on. She told the New York Post that she loved the sport and grew up rooting for the Dallas Mavericks, and that her dad took her to games all the time as a kid. That is a fun detail, since she now watches a 7-footer play for a living.
For college, Kourtney went to Henderson State University in Arkansas. She earned a degree in athletic training and graduated in 2014. She was also active outside the classroom. She cheered for the school’s co-ed team and served as team captain. She has also shared that she coached cheer during college for very low pay, about $6.25 an hour.
Her story is a good reminder that many models start out with a totally different plan. Kourtney studied a health-related field first, then built a modeling career alongside it.
Kourtney Kellar’s Career & Professional Life
Modeling has been at the center of Kourtney’s professional life for more than a decade. She has said she began modeling because she needed money as a college student and it helped pay for her education. Over time, it became a full career.
She is best known as a fashion, swimwear and lingerie model. Several profile sites report that she has appeared on magazine covers, including Maxim, and worked with brands such as Fashion Nova and Guess. Those profiles are not all from top-tier outlets, so it is best to view the exact list of covers as “reported” rather than confirmed.
Kourtney is also a familiar face in boxing. She has worked as a ring girl at professional fights, including a main event ring girl role at the 2019 Errol Spence fight against Mickey Garcia. In 2025, she made a comeback in that role. She returned as a ring girl for Katie Taylor vs. Amanda Serrano, her first time back since giving birth to her son in 2024.
She has also moved into business. One brand profile describes her as the founder of “By Kourtney”. In May 2026, she posted about attending a luncheon for ReMerge, a group that helps mothers rebuild their lives, which shows she uses her platform for community causes as well. She said the group helps moms break cycles and rebuild their futures for themselves and their kids.
What about her net worth? There is no reliable, publicly verified figure. Some websites publish estimates, but they rarely show where the numbers come from. It is safer to say her income likely comes from modeling, brand deals, appearances and social media.
How Did Isaiah Hartenstein and Kourtney Kellar Meet?
Their love story began online. According to several reports, the pair met through Instagram, and Isaiah made the first move. He slid into her Instagram DMs in 2019. Reports say they started dating in February 2019.
At that time, Isaiah was still building his NBA career. He had entered the league with the Houston Rockets in 2018 and would later play for Denver, Cleveland, the Clippers and the Knicks before landing in Oklahoma City. Kourtney was with him through those moves. She was a lifelong basketball fan, so life around the NBA did not feel foreign to her.
The next big step came in the spring of 2022. They got engaged in April 2022, when Isaiah proposed in Malibu. That was just before he signed with the New York Knicks, so the couple’s life changed a lot that year.
The pair have since been open about how much fun they have together. They appeared on a Whistle Sports series called “Home Team,” playing a version of The Newlywed Game. In one funny moment, Isaiah asked Kourtney who his worst seat neighbor on the team bus was, and she correctly said Josh Hart. Moments like that helped fans see their playful side.
Isaiah Hartenstein and Wife Kourtney Kellar: Marriage & Wedding Details
Isaiah and Kourtney got married in the summer of 2023. Several reports say they exchanged vows on July 29 in California. According to one profile, it was a yacht wedding ceremony in Newport Beach, California.
A yacht wedding is unusual, and it fit the couple’s style well. It was a relaxed, ocean-view celebration for a pair who had already been together more than four years. Beyond the location and the boat, the couple has kept most personal details private, so there is not much confirmed information about the guest list or the ceremony itself.
Sports websites sometimes get the wedding year wrong. One Sports Illustrated article says the two have been married since 2013, but this looks like a typo. Most other sources, including Fox News, agree that the couple tied the knot in 2023 in California.
Since the wedding, the Hartensteins have moved cities together. They left New York after two seasons with the Knicks, and Isaiah joined the Thunder. Their marriage now includes both a big career change and a growing family.
Children & Family Life of Isaiah Hartenstein’s Wife
The couple has one child, a son named Elijah James. Reports say he was born in May 2024. Kourtney announced the pregnancy with a cute post showing a baby jersey with the number 55 and the family name, along with a joke about a “7 foot baby loading”.
Elijah arrived at a busy time. Just weeks after his birth, Isaiah agreed to a new deal with the Thunder. The team welcomed the whole family at Paycom Center, and Kourtney thanked the Thunder for the thoughtful details that made their family feel so welcome. Isaiah’s parents and sister were there too.
Elijah then became a fan favorite. After the Thunder won the 2025 NBA Finals, the little boy fell asleep in his dad’s arms, and Shai Gilgeous-Alexander had to remind Isaiah to support his son’s neck. Clips of that moment spread quickly online.
As for balancing public and private life, Kourtney shares plenty about being a mom and an NBA wife. She regularly posts about her life, her modeling and being married to an NBA player. At the same time, the family keeps many details of day-to-day life out of the spotlight.
Kourtney Kellar on Social Media: Isaiah Hartenstein’s Wife Online
Kourtney has built a large following. Her Instagram account has been reported at more than 640,000 followers in 2026. Her TikTok has roughly 444,500 followers, and earlier reports said her videos had drawn over 24 million likes. Follower counts change often, so check her profiles for the latest numbers.
Her content mixes fashion, travel, family moments and behind-the-scenes NBA life. One of her best-known TikToks showed unusual items you can find in an NBA player’s home, which fans found funny and relatable. She also posts from red carpets. In July 2025, she attended the ESPYs with Isaiah, and her brown dress drew a lot of attention.
Quick Facts Table: Isaiah Hartenstein’s Wife
| Detail | Info |
|---|---|
| Full Name | Kourtney Kellar (also styled Kourtney Kellar Hartenstein) |
| Date of Birth | March 8, 1991 |
| Nationality | American |
| Profession | Model, influencer, ring girl, business founder |
| Married to | Isaiah Hartenstein (Oklahoma City Thunder) |
| Marriage Year | 2023 (reported July 29, California) |
| Children | 1 son, Elijah James (born 2024) |
| Net Worth | Not publicly verified |
FAQ: Isaiah Hartenstein’s Wife
Q: What is Isaiah Hartenstein’s wife’s name?
A: Isaiah Hartenstein’s wife is Kourtney Kellar, also known as Kourtney Kellar Hartenstein. She is an American model and social media creator.
Q: How old is Kourtney Kellar?
A: Kourtney Kellar was born on March 8, 1991. As of September 2026, she is 35 years old.
Q: What does Kourtney Kellar do for a living?
A: She works mainly as a model and influencer. She has also worked as a boxing ring girl and runs her own brand, By Kourtney.
Q: When did Isaiah Hartenstein and Kourtney Kellar get married?
A: They married in July 2023 in California. Several reports give the date as July 29, with a yacht ceremony in Newport Beach.
Q: How many kids do Isaiah Hartenstein and Kourtney Kellar have?
A: They have one child, a son named Elijah James, born in 2024. No other children have been publicly reported.
Conclusion
Kourtney Kellar is a Texas-raised model, former college cheer captain and social media creator who built her own career long before the NBA spotlight. Isaiah Hartenstein’s wife has been at his side since a simple Instagram message in 2019. Together they have moved across the country, celebrated an NBA championship and welcomed their son, Elijah.
From a yacht wedding in California to cheering from the stands in Oklahoma City, this couple has plenty of milestones behind them and more ahead. Whenever fans search for Isaiah Hartenstein’s wife, they find a story of teamwork, humor and a family that seems to enjoy every moment together.
