British model Cara Delevingne is convinced her pal Rihanna has very few female friends because women don't "understand her".

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."