Kim Kardashian sex tape with ex-boyfriend rapper Ray J was allegedly momager Kris Jenner’s idea to make money, according to bombshell claims by Myla Sinanaj, the supposed girlfriend of Kim’s estranged husband Kris Humphries.

If true, the claim upends Kim’s long-standing assertion that she never meant the tape to be public and was humiliated by it when it leaked, a story she repeated to Oprah Winfrey only last week.

Kim also raised eyebrows on Oprah when she revealed her mother put her on birth control pills at 14 so she could have sex.

Ironically, Kim’s lawyers have subpoenaed Sinanaj as a witness in the looming divorce trial. But with comments like that, they might be rethinking that move.

The revelation is the most damning yet to come out about Kardashian, her rise to fame and her reality television empire, from which she has made a fortune.

Sinanaj claims Humphries told her a number of details about the reality TV star during their short relationship, according to gossip site TMZ.

In fact, Humphries said momager Jenner not only told Kim to make a sex tape, but also to re-film the original because it wasn’t “pretty enough,” according to Sinanaj.

After the tape became public and portions leaked on line in 2007, Kim cut a deal with porn producer Vivid Entertainment to market the sex tape. She reportedly got $5 million and a cut of the profits.

The publicity over the tape opened the door for Kim’s reality show on the E! Network. She also did a spread in Playboy the same year because of the tape.

Kardashian has countered through a source that she never discussed the tape with Humphries because she didn’t want it to be an issue in their relationship.

Myla and Humphries are embroiled in their own dispute over the extend of their relationship. Humphries has claimed they were never dating, but she says she has text messages from Kris calling her the “love of his life.”

Her lawyer Joe Tacopina said Sinanaj has not ruled out assisting Kardashian in her divorce case. But with a witness like her, who needs a loose cannon?