Paris Hilton, Lindsay Lohan and Samantha Ronson were just a few of the stars celebrating the grand opening of Apple Lounge last night.

Sam was deejaying the event, with Linds, looking lovely, at her side. The duo arrived at the Robertson Boulevard hot spot at 11 p.m. and managed to sneak in relatively unnoticed. But they left around 1:45 a.m. to a flashbulb frenzy.

Paris (who must be wearing a serious push-up bra) stayed until 2 in the morning and was one of the last people to leave the bar. Witnesses say the heiress was still hanging out even after they turned off the music.

Other party guests included Nicky Hilton Rothschild,who left about 45 minutes earlier than her big sis, Christina Milian and Tila Tequila, who doesn't go anywhere these days without girlfriend (and former Lindsay pal) Courtenay Semel.