Zac Efron

Zac Efron in High School Musical 2

Happy birthday to teen heartthrob Zac Efron, who turns 20 today. The star of High School Musical and the recent sequel, High School Musical 2, Efron was named one of People magazine's 100 Most Beautiful People of 2007. He and costar Vanessa Anne Hudgens made chart history this year when their single, "Breaking Free," jumped from #86 to #4 in two weeks, making it Billboard's fastest-climbing record ever. Efron also played Link Larkin in the movie musical Hairspray, starring alongside John Travolta and Michelle Pfeiffer.

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From our Archives: Today's Highlights, October 18, 2007