Contrary to rumors, Rob Pattinson didn't get revenge on Kristen Stewart during a recent night out. Although it was reported that the actor was "getting cozy" with a blonde, insiders say that the conversation was innocent. A blurry photograph of the actor talking to a girl at a club last weekend leaked online but sources say that they were chatting "in a friendly way, nothing more. He kept to himself mostly." Many are claiming the woman in question was actually Sienna Miller -- the fiance of Rob's friend Tom Sturridge. A witness added, "He was hanging out with some friends," and "was chatting with a table of people drinking beers . . . there were girls and guys there." Since Rob and Kristen are supposedly back together, why aren't they stepping out? A friend told Us Weekly, "They're afraid of backlash, so they're keeping things on the down-low." To see the pics of Rob with the mystery woman, click here!