After the successful release of a soundtrack in late 2006, it became apparent that the 14-year-old singer had the rock-star potential of her onscreen alter-ego. "Hannah Montana" was the first-ever soundtrack to debut at No. 1 on Billboard's Top 200.
At left, Cyrus makes an appearance on MTV's Total Request Live with "High School Musical" star Ashley Tisdale. (Peter Kramer/Getty Images)