Vince Vaughn seanvaughn.jpg InTouch Weekly is reporting that on December 8th - nearly three weeks before filing for divorce - Sean partied at the Homestead bar in San Francisco with frat packer Vince Vaughn!

An onlooker alleges that the actors, who've been friends since filming Into The Wild, were "drinking heavily" and dancing with several women.

While Vince ended up making out with one girl, Sean's attention was a little more fickle - observers reported seeing "various ladies dancing around him, trying to get his attention".

Sounds like there's a little Spicoli left in Sean yet!