Derek Hough's Six-Pack Abs Are on Fire!

Derek Hough rocks a camo jacket while stopping for fans at The Grove on Monday night (December 21) in West Hollywood, Calif.

The Dancing With the Stars pro must have just flown in from somewhere because he hit the gym earlier in the day.

PHOTOS: Check out the latest pics of Derek Hough

“Best cure for 3 flights and almost 20 hours of flying is getting straight back into it. Motion=Emotion #motionequalsemotion #rageagainstthemachine,” Derek captioned an Instagram photo.

Derek recently opened up about visiting Bindi Irwin in her home country of Australia.