Inside the Hottest Bash in Young Hollywood

Zoey 101's Jamie-Lynn Spears and Hannah Montana star Miley Cyrus get to know each other at Teen Vogue's Young Hollywood party. "I couldn't even get my grandma tickets," Miley tells PEOPLE of her upcoming concert tour. "It's that insane. Everywhere is sold out."

Who needs paparazzi? When a Stranger Calls star Camilla Belle takes on the snapping responsibilities inside the event, which was held at Vibiana, a converted cathedral in Los Angeles.

Hayden Panettiere takes some time off from giving relationship advice to her Heroes costar Masi Oka and chats up a Young Hollywood veteran, Hilary Duff. Maybe the Dignity singer is getting advice on her new beau Mike Comrie?

Meanwhile, outside on the red carpet, Hayden's onetime beau – and Laguna Beach vet – Stephen Colletti poses for pictures in a fall-friendly black and gray ensemble.

Sisters Aly and AJ Michalka look like they're ready for anything other than a potential breakup, blowing kisses to the paparazzi on the red carpet.

Jet-setting Nancy Drew star Emma Roberts, sporting a darker do, takes a break from filming her new movie Wild Child in London and in Santa Monica to attend the event.

Fall may be approaching, but Newport Beach residents Clay and Corey Adler look tanned and ready for an endless summer of surfing, girls and drama.

Wearing J. Mendel, Emmy Rossum is all smiles and why shouldn't she be? The Poseidon star is set to release her first album. "It's called Inside Out," she tells PEOPLE. "I got to write the lyrics. It's very layered vocals, but also some piano vocals. It's just really exciting for me." Hear Emmy singing in her PEOPLE.com Video Diary!