Introducing the Jonas Girls...

You’ll be hearing a lot more about Chelsea Staub (left) and Nicole Anderson (right) as as they will be costarring alongside the Jonas Brothers in the upcoming Disney Channel series JONAS (premieres Spring 2009) The pair walked the red carpet at the premiere of High School Musical 3: Senior Year at the Galen Center at the University Of Southern California on Thursday in L.A.

Five minutes before Chelsea, 20, left her house for the premiere, the zipper broke on the dress she was supposed to wear. The moral to the story, she says, “Always have a backup dress.” Chelsea, who went with a floor-grazing Meghan dress, said the premiere was fantastic and loved saying hi to the HSM3 cast after the movie. “I was just so impressed with the whole movie,” she said.

Nicole, who was styled by Basia Richard for the event, went with a T-bags dress, Courtney Crawford shoes and 213 Industry belt. Her favorite scene from HSM3 was Zac Efronand Vanessa Hudgens waltzing on the rooftop of East High. She showed up right after HSM3 star Ashley Tisdale hit the red carpet and gushed how beautiful she looked. Nicole, 18, also commented how amazing it was to have so many enthusiastic HSM fans under one roof.