Actress Lee Si Young made a surprising confession that she recently gained 15 pounds. 

During the press conference for the film 'Killer Toon', when asked to show off her outfit which had a revealing backside, Lee Si Young shared, "I specifically made a request for an outfit that covers everything because I gained weight, so I didn't realize that the outfit would end up revealing so much of my backside."

Park Kyung Lim commented, "Lee Si Young told me that she gained weight and said that she weighs the same as I do. I was shocked. She doesn't seem that way."

Lee Si Young revealed, "I gained 7 kg (~15.4 lbs.) so far", which could very well be muscle weight coming from her budding career as a national boxer or perhaps her wish to compete in a different weight group.

'Killer Toon' will premiere on June 27th!