Zac Efron Birthday Party Pictures in London

Zac Efron was looking sharp even after a long night out with some guy friends leaving London nightclub the Box in the wee hours of this morning. The actor turned 24 earlier in the week, and while he celebrated by checking out London's popular burlesque club, we got in the spirit of Zac's birthday with a slideshow of his hottest shirtless pictures through the years. Zac recently wrapped production on both The Paperboy in New Orleans and an untitled Ramin Bahrani movie, which he shot in Illinois. Now he's looking forward to a very busy 2012 with five films hitting theaters, but first up he'll close out this year promoting his ensemble project New Year's Eve with the rest of the star-studded cast.