Tinchy Stryder signed a pair of breasts while surrounded by old ladies.
The British rapper found it hilarious when a female fan stripped off, handed him a pen and made him sign her curvaceous assets.
He said: "One time, I was walking down Bow High Street in London and this girl sees me and screams, 'Oh my days, it's you, can I have your autograph?' She puts her bag down and hands me a pen. I thought she was going to get a picture out or something, and instead, she gets her breasts out in the middle of a day in a shopping centre!"
However, the 22-year-old star is finds it amusing women want to get naked in front of him and isn't shocked by the behaviour any more.
He explained: "It's happened at concerts when I'm performing, but in the day? Next to grannies with their shopping trollies? I still signed them, though. I couldn't stop laughing."