Did Justin Timberlake Cheat on Jessica Biel?

Sources say the singer hooked up with Olivia Munn, but Timberlake's rep insists the claims are false

Another day, another cheating celebrity allegation. This time the gossip world is buzzing that Justin Timberlake has strayed from girlfriend Jessica Biel.

Back in April, tabloids had a field day over speculation that Timberlake was heating things up with ex-girlfriend Cameron Diaz on the set of their upcoming movie Bad Teacher. Now US Weekly is reporting that the singer, 29, cheated on Biel with Daily Show correspondent Olivia Munn after meeting at a party. An insider claims they saw the two being "openly affectionate" and that the Social Network star "has been telling people it's over with Jessica." 

But, once again, we find it hard to believe. On Oct. 25, Timberlake showed up at the Glamour Reel Moments event to support Biel, 28, who was being honored for her directorial debut. The two posed for photos at the after-party and looked as happy as ever.

Since the cheating rumors surfaced, Timberlake's rep has strongly denied the allegations, while Munn's rep won't comment on her personal life.

Do you believe that Justin Timberlake cheated on Jessica Biel with Olivia Munn? Chime in below!

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