Jason Dolley shows off his super-burnt chest in this new still from Good Luck Charlie, It’s Christmas.

Costar Bradley Steven Perry told JJJ of the things the cast did off-set when not filming in Salt Lake City, Utah earlier this year — Paintball!

“I never would have thought this until I tried it, but paintball really hurts!” Bradley dished. “Eric [Allan Kramer, who plays Bob] actually got a welt on his neck and we had to film the next day. It’s just really fun and Jason, who has done this before, has his own guns and things. He’s like a ninja with his paintball gun.”

He continued, “We were doing one cave and they have these balloons that you can hide behind for protection. Jason, leaps over one and in mid-air is shooting a guy on the other team and he’s rolling on the floor. Then he shoots me in the foot and Eric in the neck. When you’re shooting at Jason, he’s so skinny, it’s like shooting air.”

JJJ secret from the set: Jason will be mostly shirtless throughout the majority of the film!

30+ pics inside from Good Luck Charlie, It’s Christmas …