As if you needed more proof that Britney Spears is not a girl anymore, there's this: the mother of two turns 30 today. 30! On Dec. 2, 1981 in McComb, Miss., Spears was born, presumably making similar sounds to the ones she makes on 'I Wanna Go' and her other pop staples. (Girl has a thing for robotic baby cooing.) While Spears is best known as a pop superstar -- and tabloid train wreck -- she was once considered a movie star. Sorta! To celebrate Spears's 30th birthday, let's enjoy a clip from the cinematic classic 'Crossroads,' with future 'Avatar' star Zoe Saldana!