Will Smith's son dating Kim Kardashian's sister

Coffee date ... Jaden Smith and Kylie Jenner in London

Pacific Coast News

.Sources close to the Kardashian family tell Us Weekly magazine the two teens have been friends for years, but became romantic recently.

They were spotted together on a lunch date at Caffe Nero in London's Piccadilly Circus on Sunday ahead of Jayden's support slot on tour with Justin Bieber.

Father and son ... Will Smith and Jayden

Splash News

Kylie was previously linked to Australian pop star Cody Simpson.

She denied the rumours, telling a magazine in September: "Cody and I are just good friends."

Close ... Kim Kardashian cuddles up to half-sister Kylie Jenner at a showbiz event

Press Association

Yesterday pregnant Kim was joined by another younger sister, Khloe, as she attended the launch of her DuJour magazine cover at a party in Los Angeles.