This is going from bad to worse!

Rumors circulated earlier this month that Lamar Odom cheated on wife Khloe Kardashian with a woman named Jennifer Richardson, and now another mistress has come forward claiming to have had an affair with the basketball player. Not only that, but she passed a lie detector test!

Speaking to Star magazine, Polina Polonsky claims she enjoyed a six week affair with the Clippers star that began after they met at the Roosevelt Hotel in L.A. in June.

    "I was under the impression that he had left Khloe, and that's why he was living at the Roosevelt. He acted completely available and we definitely had a mutual attraction," she tells the mag.

The pair engaged in innocent flirtation until they consummated their relationship on June 13.

The Keeping Up with the Kardashians star apparently was aware of her husband's infidelity, and attempted to confront Polonsky at her apartment, where Odom had been shacking up almost every night until July 8. Momager Kris Jenner even got involved!

    "I couldn't believe they found where I lived and came to my apartment! They were knocking on the door, but Lamar refused to answer," she explains of the show down.

Kardashian has yet to comment on the latest cheating scandal, so the status of their relationship is anyone's guess!