By Shirley Halperin
Updated October 26, 2007 at 06:19 PM EDT

In one corner of the VIP section: The odd pairing of Jessica Simpson and SNL-alumCheri Oteri (pictured), who cackled among themselves while onlookers gawked andlongtime besties Cacee Cobb and hairstylist to the stars Ken Pavesstood watch. Directly behind the Simpson posse: recordproducer/rapper/executive/author Jermaine Dupri, with girlfriend JanetJackson on his arm. At the opposite end of the Hollywood Palladium:equally press-shy (of late) newcomer couple Zac Efron and Vanessa AnnHudgens. And somewhere in the middle: a random assortment of partyregulars like Amanda Bynes and Kristen Bell.

But with a triple bill that included Eagles of Death Metal,Silversun Pickups, and Foo Fighters, not to mention an endless march oflingerie-clad models, things were bound to get messy. For his part,Foos frontman Dave Grohl says he saw this get-paid-to-play-and-partygig as a chance “to text all my friends [and say], ‘Come out and seethe f—in tittie-fest!’,” he told us backstage before kicking off afurious 45-minute set that included Foo favorites like “My Hero,””Times Like These,” “Breakout” and new show staple (as least since theVMAs), Prince’s “Darling Nikki,” which Grohl thought, “wasappropriate.”

While we came prepared with earplugs, the ear-shredding volume was a bit much for some, like Ashley Olsen and Grey’sSara Ramirez, who bolted early, but not Efron and Hudgens, who “werefreaking out the whole time,” said a nearby observer. Simpson alsostayed well past the last note, grooving (and weirdly grinding) withPaves until she had to be helped out of the joint. Figurativelyspeaking, Grohl wasn’t far behind. “I was pretty drunk out there,” headmitted back in the band’s dressing room, where a drummer summit hadformed instantaneously (Grohl, Taylor Hawkins, Travis Barker, and Jet’sChris Cester). “But that [made it] a fun show!”

addCredit(“Cheri Oteri and Jessica Simpson: Jeff Vespa/”)