08/24/2009 at 01:00 AM EDT
>• Half of a pop duo with her sister AJ, the 20-year-old makes her big-screen debut.
ON GETTING STARTED EARLY When I was 10 AJ and I wrote our first song with our mom. We've always been into putting on a show.
ON BANDSLAM DOWNTIME We did karaoke at this hole-in-the-wall. You got onion chips as a prize if you won. We sang "Livin' on a Prayer." It was wild.
ON FAME'S PITFALLS You won't see me involved with scandals or nude pictures. The root of that is low self-esteem.
ON CLUBBING I'd rather be at home in my pajamas!