Keegan Allen Shirtless Pic Shows Off His Sexy Six-Pack (PHOTO)

"Me and @KeeganAllen on set. We told you Toby was a bad boy. Tomorrow night you get to see how bad;)," PLL screenwriter Maya Goldsmith tweeted, along with this shirtless photo. Excuse us while we drool until tonight's episode.

Catch the next episode of Pretty Little Liars on Tuesday, January 29, 2013 at 8 p.m. ET/PT on ABC Family.