ZAYN MALIK from ONE DIRECTION cheated on his girlfriend recently . . . and after it was over, he was a total JERK to his side-action. Unfortunately for him, she took PICTURES of him in bed, then posted them on the web.
--A waitress named Courtney says she went back to Zayn's home after a party . . . and after he assured her he was single. Not being a One Direction fan, Courtney says she didn't know any better.
--Even though Zayn is 20 years old, his house was like a kid's playroom. Courtney says, quote, "He had remote control cars and skateboards floating around the house to play with."
--"There was a 'Star Wars' mask . . . and there was a life-size Kung Fu Panda under his stairs. It was a fun house."
--Then came the sex, which Courtney says was AMAZING. But apparently Zayn's not much for afterglow. She says, quote, "Zayn made me feel special . . . but after sex he just said, 'Put your clothes on, I'll get you a taxi.'"
--Before that happened, though, Courtney took a couple pictures of Zayn asleep in bed, post-coitus.
--Zayn's girlfriend is PERRIE EDWARDS, the blonde from the British girl group LITTLE MIX. They were put together on the British version of "X Factor", just like One Direction was a season earlier.