Khloé Kardashian and James Harden Break Up

Khloé Kardashian and James Harden have called it quits, WHO has confirmed.

The reality star called off her relationship with the Houston Rockets player, a source tells WHO.

The Keeping up with the Kardashians star and NBA pro began dating over the summer, but a source previously told WHO the relationship became strained after Kardashian's estranged husband Lamar Odom's health crisis.

Khloe Kardashian and James Harden have reportedly split. Photo: Getty

Odom was found unconscious at a Las Vegas brothel Oct. 13 and spent weeks hospitalised, with Kardashian dedicating a large amount of time to supporting his ongoing recovery. In January he moved from Cedars-Sinai Medical Center in Los Angeles to a live-in rehabilitation centre.

"It hasn't been easy. James obviously has wanted to see her more and be with her more, but she's felt like she needed to stay in L.A. to be with her family and to deal with Lamar stuff," a source close to the family previously WHO. "That has put some strain on things."

Kardashian, 31, previously told WHO that Harden, 26, had remained supportive as she attended to Odom, saying he had been "very supportive and awesome."

Khloe Kardashian and Lamar Odom. Photo: Getty

"I'm just allowing everything to unfold. If it's ever too overwhelming [for him], then I understand that as well," Kardashian said.

Kardashian and Odom put their divorce on hold in October as they dealt with his health issues, though she told WHO shortly after that did not mean she Odom were back together.

On Sunday, Kardashian and her sister Kim Kardashian West spent some time with Odom for the Super Bowl.

ELIZABETH LEONARD AND AILI NAHAS writes for People.com