06/28/2011 AT 5:00 PM ET
Jake Gyllenhaal was cracking up and laughing with pals during a lively night at West Hollywood’s Chateau Marmont – but the actor gave special attention to one woman: Olivia Wilde. The two were very flirty, an onlooker says, acting “touchy-feely.” Says the onlooker: “At one point, he had his hand on hers.” Still, the two weren’t overly affectionate with each other. “Olivia was very cool,” the onlooker says, “and wasn’t fawning over Jake but seemed to like the attention he was giving her.” Alas, at the end of the evening the two went their separate ways. As for their relationship, the actress’s rep tells us they’re just friends.