Mario Testino at PRISM Party | Pictures

Miley Cyrus and Rachel Zoe helped celebrate with Mario Testino at a big pre-Oscars bash in LA. It was a private reception toasting Mario's new exhibit at LA gallery Prism, which features many of his most famous photos. Plenty of his admirers were on hand yesterday, including models Alessandra Ambrosio, Jessica Hart, and Liberty Ross. Marisa Tomei and Kim Kardashian made the rounds as well. Kim was happy to finally cross paths with Mario, tweeting afterward, "Fun night! Met one of my favorite photographers, Mario Testino!" Mario's party was one of the many taking place in Hollywood one day before the Oscars — see all the stars partying at Oscars events.