Los Angeles, August 4 –Paris Hilton must have a good makeup artist, because she was noticeably bruise-free at Wednesday’s T Mobile Sidekick 2 launch party. Young Hollywood packed rhe party at the Grove – Kirsten Dunst solo, Ali Landry, Adam Brody, Adrien Grenier of the new HBO series Entourage, Jessica Alba, etc. The evening may have marked Britney Spears’ first babysitting gig, since Shar Jackson showed up, her first outing since having Kevin Federline’s baby only a few weeks ago.

Lindsay Lohan and Wilmer Valderrama held hands as they approached the party, but split apart when photogs swarmed. Someone even asked Valderrama why he won’t be photographed together with Lohan, as a couple. “Nobody wants that photo”, was his reply. We’re wondering if Wilmer doesn’t want to be outed as hetero, since someone reminded us that he never liked being photographed with his ex, Mandy Moore, either.

The Black Eyed Peas performed on the rooftop while the Action sports team rode bikes on a gated ramp.

Photos by Jen Lowery