Kris Jenner has threatened to sue Ex, Bruce Jenner

Kris Jenner has allegedly threatened to sue Bruce Jenner. The Keeping Up with the Kardashian star reportedly "might take legal action" asked her ex-husband, who is expected to confirm later this week that he is transitioning into a woman, if he speaks negatively about her during his upcoming sit-down with Diane Sawyer on '20/20'.

A source close the 'Keeping Up with the Kardashians' star, who split from Bruce in October 2013 after 22 years of marriage, says she claims she had no idea he had a desire to become a woman until after they separated.

The insider told gossip website TMZ.com that while Kris admits she talked to the Olympian, 65, about his "tendency" to dress like a female 25 years ago, she insists she never saw him dressed as a woman during their entire relationship.

The Kardashian family matriarch is also said to have told friends that Bruce informed their daughters, Kendall Jenner, 19, Kylie Jenner, 17, and her older daughters, Kourtney Kardashian, 35, Kim Kardashian West, 34, and Khloé Kardashian, 30, about his plans before her.

But sources close to Bruce claim Kris always knew he was very conflicted about his gender.

Kris and Bruce previously claimed they were still close friends following their split.