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Justin Timberlake has always been surrounded by cheating rumors, but there may be some truth to it this time around.

According to an unknown source, the “Social Network” star cheated on girlfriend, Jessica Biel, with actress Olivia Munn during a three-day fling after meeting at a September 26 MySpace event.

Us Weekly also weighed in on the rumor:

Munn resisted his advances, telling him it was a no-go if he was still with Biel, 28, the source tells Us Weekly. But Timberlake “has been telling people it’s over with Jessica, even though “the reality is he’s just doing it behind her back.”

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.

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