The Asian-American star, a former doctor, famously peeled off for the first The Hangover film - and he does the same in the upcoming sequel.
But Jeong had to make sure his wife was OK with his nudity before agreeing to get naked.
He says, "I run everything by my wife before I do anything, so I had full permission from her to do all the nudity filming. I'm very blessed I have such a supportive wife that is secure with letting me embarrass myself.
"She always says that these movies are good for men because, after watching me, they always go home feeling good about themselves. I wish I was lying but she really said that."