Delevingne grew close to the pop singer two years after she visited the U.K. for a show, and the runway star reveals Rihanna leads a relatively lonely life.
She tells Britain's Grazia magazine, "I met her when she was here two years ago doing a gig. And then she sang at the Victoria's Secret show and we hung out. She looks after me when I go to L.A. She's the best, she's such a sweet, down-to-earth girl. She doesn't have that many girlfriends but we have a lot in common. I don't think many girls understand her."