Could it be?  A cheater?  In Hollywood?  No!!!  Pretty boy, Justin Timberlake is being called out for cheating on his sexy girlfriend, Jessica Biel with the also hot, Olivia Munn. It's so ridiculous.  But I wouldn't be surprised if it was true.  The way marriages and long term relationships are dropping like flies in Hollywood these days, why not?

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Olivia and Justin met at a MySpace event at the end of September when he allegedly got her number and sources have been telling Us Weekly that Justin,

"started chasing her immediately."  And Justin "has been telling people it’s over with Jessica, even though "the reality is he's just doing it behind her back."

So Justin and Olivia went to her hotel, the Gansevoort Park Avenue NYC, for a couple of nights where "they were openly affectionate."  and "had amazing sex."

Well, if they did have sex, I am sure it was amazing.  That Justin is quite the boy toy…. oh sorry, my mind was wandering to the hotel room scene…..

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Is it true?  Maybe, maybe not.  Timberlake's rep of course denies it all.  Munn's rep doesn't speak on her personal like.  And well, it's radio silence on Biel's end.  My money says Justin is a naughty boy…..with both of them…..

Photos: WENN