Paris and Nicky Hilton get their party on at LAX Nightclub in preparation for Nicky's 25th b-day tomorrow.

The socialite sisters made their grand entrance down a staircase as Paris' tune "Stars Are Blind" played in the background. They were accompanied by Paris' boyfriend Benji Madden.

The former "Simple Life" star's new reality show, "Paris Hilton's My New BFF," airs Tuesdays at 10 p.m. on MTV.