Jay Park revealed why he always takes his shirt off at concerts.

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On the July 22 episode of 'Yoo Hee Yeol's Sketchbook,' Jay Park featured as a musical guest alongside Ugly Duck. The rapper explained why he tended to bare his top, saying, "When I don't, the audience yells at me to take it off. The way things are going I'll still be taking off my shirt when I'm a grandpa."

No one seems to be complaining! Check out Jay Park's performances with Ugly Duck on 'Sketchbook' if you missed them�as well as their recent MV for "PUT'EM UP"!�