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Us Weekly reports that Justin Timberlake cheated on Jessica Biel with Olivia Munn. Yea, that Olivia Munn who panders to the disenfranchised. Timberlake and Munn met on Sep. 26 at a MySpace event. They exchanged numbers and Justin “started chasing her immediately.”

At first, Munn told him that she wouldn’t do anything since he was still with Jessica but that problem was easily taken care of by telling Olivia the lie she wanted to hear. That he and Jessica Biel were over. Turns out “the reality is he’s just doing it behind her back.” Suckkkkkaaaa! Of course, Justin’s reps deny this and Olivia’s rep has no comment.

Believing he had left Biel and that her relationship with Timberlake might develop into something serious, Munn took him to her hotel, the Gansevoort Park Avenue NYC, Sept. 27 and 28, where “they were openly affectionate,” the insider adds.

The insider tells Us the two “had amazing sex” that night.

HollywoodLife adds,

Sources say the pair were openly affectionate on Sep. 27 while sitting at a back table at Avenue nightclub. “At one point, Olivia did a seductive little dance with Justin,” one said. “Then, while he was dancing, she came up behind him and he held her hand behind his back.”

I’m a little curious as to how easily Jessica Biel would break Olivia Munn. A catfight between those two would last all of two minutes. One minute to chase Munn down like the T1000, 30 seconds to knock her out and another 30 seconds to flee the scene.