But if you really look around, it's hard to go anywhere in Hollywood now without bumping into a beard: Zac Efron, Jon Hamm, Conan o 'brien, and George Clooney have all recently sported them.

Zac Efron is set to challenge Adrian Grenier for the title of top TV hunk - the teen heart-throb will make an appearance on the HBO hit Entourage.

Actor Zac Efron is leaving his High School Musical days behind him to hit the books at a California university.