And then there's her "bad" side.
The pouty brunette shakes off her signature headband and flaunts her edgier side on the new single "Good Girls Go Bad" by electro-pop band Cobra Starship.
Leighton's singing is pitch perfect and set against a robotic and insanely catchy hook (auto-tune, anyone?). The song, produced by American Idol judge Kara DioGuardi, features some tinny vocals and has moments of pure cheese but will have you loving it despite its short-comings.
Frontman Saporta told VH1 last April he was thrilled to work with the "Gossip Girl" star.
"Can you believe I get to do a song with Blair Waldorf?" Saporta gushed. "It's no secret that I am a huge 'Gossip Girl' fan."
The song's video -- shot in New York's Lower East Side -- features a party scene at an illegal casino in the basement of a deli. It's worth watching until the end not only for the pop beat, but because the video finishes with a clever twist.
Meester released the single "Birthday" last Spring.