Matt Smith: Shirtless Singer for 'How to Catch a Monster'!

Matt Smith shows off his slim shirtless body while stepping out of his trailer on the set of his new movie How to Catch a Monster on Monday (May 13) in Detroit, Mich.

The 30-year-old actor, who had to shave his signature Doctor Who floppy hair for the new movie, was seen singing a song on top of a stage during the afternoon shoot.

PHOTOS: Check out the latest pics of Matt Smith

Make sure to catch the season finale of Doctor Who this Saturday Night (May 18) on BBC!

30+ pictures inside of Matt Smith on the set…