Justin Timberlake Cheated on Jessica Biel?

Justin Timberlake may have to blame it on the a-a-a-a-a-alcohol! He was caught up in the club with an unknown brunette chick in a white hat. Justin and said mystery ho were at Avenue nightclub in New York's Chelsea district on Monday night where they were reportedly kissing, hand holding and canoodling.

Timberlake was so limber off Patron shots that he started dancing alone atop his booth (see top photo). He also treated guests (including Lindsay Lohan and Owen Wilson) to a three-minute breakdance in which he rolled around the floor and accidentally crashed into surrounding patrons. Classy!

Lohan, just a few feet from the scene, Tweeted when she saw JT with the brunette around three a.m.: “So dark where’s jb [Jessica Biel] cheater?” she wrote.

I'm not really buying this. The details don't sound like Timberdouche. I'd expect JT to tell the DJ to play a few of his songs, lay a ho out on a table up in the VIP section and make love to her while his conceited ass sings to his own music.