Before Sean Penn's wife, Robin Wright Penn, filed for divorce after 11 years of marriage, he partied like a bachelor. Sean and single pal Vince Vaughn enjoyed a wild boys' night at the Homestead bar in San Francisco on December 8. The actors, who became close in 2007 on the set of Into the Wild, were "drinking heavily," says one onlooker, and openly flirting with women all night. While Vince made out with one girl, Sean had various ladies dancing around him, trying to get his attention.
Check out In Touch for more on Sean's wild night.