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Despite his good looks, charming smile and amazing vocal/acting talents, Zac Efron declares himself a "nerd." Zac appeared on Conan last night and during his time with the comedic talk show host, the duo not only talked about Zac's ability to pick up the ladies, but performed a live A Capella version of Barbara Ann, which is originally by the Beach Boys.

Zac told Conan that he always thought of himself as a "pretty big nerd" and still kind of does. The Lucky One star said he has alwyas been into music theater and was an attention seeker.

What do you think of Zac's appearance on Conan?