It only takes three seconds of listening to Demi Lovato 's first album, Don't Forget , for her to tell you what she's all about. "I am confident, but I still have my moments / Baby, that's just me," she sings over fuzzy guitar licks on the opening track, "La La Land." That kicks off three minutes of spunky self-declaration: She's a girl who eats McDonald's, wears Converse, and refuses to get chewed up by the "la la land ma-shayn." That's a bold statement from a teen who had just become an overnight sensation via the megastar-making Disney empire, but it introduced Demi in totally authentic fashion — and gave us the template for what would become an entire career built on bold statements.Don't Forget celebrates its 10th anniversary on September 23, marking a decade of Lovato's prominence in pop. That decade has been, simply put, a roller coaster — in between releasing six albums and charting four Top 10 hits, she's openly battled addiction and mental illness, and recently

entered rehab

after a

frightening overdose

in July. That's even more reason for fans to revisit and celebrate Lovato's music, which she introduced to the world with a voice that commanded attention. "Demi's talent is totally responsible for her being capable of evolving," said Jon Lind, the A&R executive who shaped Lovato's first three albums on Hollywood Records. "I mean, [her voice] is not shy; that's the last thing you would say. Basically, it's like, 'Bolt the furniture to the floor, I'm Demi Lovato.'" A DISNEY-BRED STAR Like Hilary Duff and Miley Cyrus before her, Lovato's pop career coincided with her rise as a wand-wielding Disney Channel starlet. After a season on the short-form comedy As the Bell Rings , she landed a starring role in