THERMAL, Calif. (AP) — Carmen Electra showed off her fiance and black diamond engagement ring at an excluse Coachella after-party, while the Hilton sisters frolicked with their beaus.

Paris Hilton and Benji Madden arrived just before midnight Saturday, greeting DJ Steve Aoki with hugs at an airport hangar transformed into a makeshift nightclub about eight miles from the Coachella Valley Music and Arts Festival.

While Nicky Hilton and David Katzenberg held court in a corner booth at the invite-only T-Mobile Tone Def After Party, Electra and Rob Peterson wandered with their hands firmly clasped.

Electra announced her engagement to the musician on Thursday.

Paris Hilton and Madden were inseparable throughout the evening as they snapped photos of each other and friends, watched partygoers perform karaoke in the PlayStation 3 "SingStar" Lounge, and scarfed down nachos and hot dogs from food trucks parked inside the event.

During the celebration, attendees were invited to customize T-Mobile devices and Michael Stars T-shirts, receive makeup makeovers from Too Faced Cosmetics, lounge on beds underneath vintage posters, and dance to tunes provided by Aoki, Adam "DJ AM" Goldstein and "That '70s Show" actor Danny "DJ MomJeans" Masterson, who all operated from separate booths on the dance floor.

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Coachella Valley Music and Arts Festival: http://www.coachella.com