Bieber jealous of Selena's friendship with Cara Delevingne

Singer Justin Bieber is reportedly unhappy with on-and-off girlfriend Selena Gomez's new found friendship with Cara Delevingne.

Bieber, 20, also called Delevingne, 21, to ask about what's going on between her and Gomez, 22, reported The Hollywood Life.

"Justin has called Cara on more than one occasion, wanting to know what's going on," an insider said, adding, that Bieber should not be worried about their closeness.

"She's just having fun with a new pal," the insider said.