Katy Perry

John Sciulli/WireImage

Rain or shine, celebs like to party!

Despite a little drizzle yesterday, Hollywood stars were out in full force celebrating the Coachella music festival in the California dessert.

Katy Perry made her annual trip to the festival and hit the Hennessy and Details @ Midnight bash late last night. So which one of her favorite guys was by her side?

Perry's BFF Markus Molinari was with her, as were about a dozen of her pals. The group arrived to the private estate around 2 a.m. after enjoying music at the festival.

The "California Gurls" singer was donning a Friday the 13th-inspired getup of black shoes, black House of Holland for Pretty Polly tights, a black dress, black hat, sunglasses and new purple hair.

Perry and her gang chilled in a private backstage lounge area inside the house. They were very calm throughout the night while chatting and sipping vodka and tequila cocktails. "She was in a great mood," a source said of the 27-year-old beauty, who hit the road about an hour after arriving.

Meanwhile, across town, Chord Overstreet, Emma Roberts, Gerard Butler, Jesse Tyler Ferguson, Ke$ha, Lindsay Lohan, Paris Hilton and Penn Badgley partied at GenArt's Muse event powered by Ciroc.

Earlier in the day, Jessica Szohr, Haylie Duff and Kat Graham hit the Guess Hotel pool party where Duff gushed to us about sister Hilary and her new baby boy Luca.

"He's so precious and he's such a good baby," she said. "He doesn't cry a lot. He's amazing. And her natural instincts are remarkable. They really are."

Over at the Saguaro Hotel, Mischa Barton and Revenge's Ashley Madekwe dined together at the Lexus private dinner at Tinto restaurant. Pete Wentz was also there with girlfriend Meagan Camper.

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