Oprah Winfrey is set to appear on Keeping Up with the Kardashians.

The star appears to have bonded with the Kardashian family after interviewing them for her OWN TV network. According to Us Weekly, Oprah has agreed to feature in an episode of their hit E! reality show.

"Oprah signed the release!" a source revealed.

Oprah is believed to have been particularly entertained by Khlo Kardashian during their recent sit-down. Khlo is renowned for being outspoken and often crass, but Oprah loved spending time with her.

"She and Khlo especially hit it off. Khlo had her dying laughing," a source added. "It meant so much because she loves Oprah!"

During the interview with the whole Kardashian family, Oprah quizzed Kim on her infamous sex tape, using birth control from the age of 14, her failed marriage to Kris Humphries and blossoming romance with Kanye West.

She also spoke to Kim's mom Kris Jenner about her divorce from Robert Kardashian, while Khlo confessed she felt under pressure to be a "great wife" to her basketball star husband Lamar Odom.