Heroes' Hayden Panettiere showed up at Hilary Duff's MTV party @ The Abbey in Boys Town last night with her BF Stephen Colletti and her BFF Rumer Willis! What a cute threesome they make - the girls even made the overprotective MTV VJ sit in the back of Rumer's dirty Suburu station wagon! Also at the party were Lindsay Lohan (whose car was accosted by an avid fan upon leaving, Hilary had to be escorted out by the Abbey's bouncers, as did sister Haylie and new BF Kevin Connolly!