Best of 2007

21 & Under: Hottest Breakout Stars

Zac! Rihanna! Shia! Lauren! These kids aren't only the most popular, they're also the most likely to get bigger in '08. By Aaron Parsley

THE INGÉNUE

As High School Musical 2's popular girl – not to mention Zac Efron's girlfriend! – Vanessa Anne Hudgens, 18, was the envy of every teenage girl in America. Then an Internet scandal threatened to derail her status as a Disney darling – until her heartfelt apology tempered her youthful mistake, proving she's still got the good girl charm that made her a star.