Sinanaj has been pulled into the divorce battle between Humphries and Kardashian as reports surfaced that the sexy brunette has emails, texts and documents detailing a relationship with Humphries that could potentially hurt him in his divorce case against Kardashian.
But, according to TMZ, Sinanaj is also in possession of details that could damage Kris Jenner and the Kardashian clan.
"(Humphries) trashed (Kardashian) and her family in conversations and text messages to his former girlfriend Sinanaj ... telling her Kris Jenner not only directed Kim to shoot her sex tape, but to re-shoot because Kris J didn't think the first one was pretty enough," TMZ reported.
The reference is to the infamous homemade sex video Kim shot with then-boyfriend Ray J in 2003, which leaked in 2007. Kardashian wound up getting a whopping $US5 million ($4.97 million) for the video after settling with the film's distributor, Vivid Entertainment.
Sources close to the Kardashian clan countered to TMZ that Humphries, 27, is "lying" in the conversations with Sinanaj about the sex tape details.
"(Humphries) is lying about the sex tape," TMZ reported sources as saying.
"Kim made it clear at the beginning of their relationship she would not discuss the tape because she didn't want to be judged by it ... the sex tape never came up in any subsequent discussions between Kim and (Humphries), and it just shows he's delusional."
In an upcoming interview on Oprah's Next Chapter, Kardashian, 31, tells the talk show diva that the sex tape "humiliated" her family.