Zac Efron [1] showed off his arms in a denim shirt at the MTV Movie Awards in LA on Sunday, where he's nominated for best shirtless [2] performance for That Awkward Moment. Zac's promised that if he beats Chris Hemsworth for Thor: The Dark World in the category, that he'll accept the award sans shirt! This is just Zac's latest stop by the MTV Movie Awards [3], since he's been attending — and making the show worth watching — for years.

Source: Instagram user MTV [4]

Source: Instagram user MTV [5]

Source: Twitter user ZacEfron_NewsTR [6]