Happy Birthday, Zac Efron! It’s hard to believe that the High School Musical teen idol who melted the hearts of every adolescent girl is turning 27. Nonetheless, the handsome actor is now a far cry from his days of singing escapades in the hallways of East High School. Most recently, the California native entertained us in comedies like That Awkward Moment and Neighbors and is gearing up for the 2015 release of his newest project We Are Your Friends with sultry “Blurred Lines” model-turned-actress Emily Ratajkowski. Celebrate Zac’s birthday (and treat yourself) by taking a look at the hottest celebrity abs or just reminisce on that one time when he was shirtless at the MTV Video Music Awards. Happy Birthday, Zac!