Mariah Carey has sparked rumours she is engaged to boyfriend Nick Cannon after sporting a ring on her wedding finger at the TriBeCa Film Festival.

The singer has been dating Cannon since he teamed up with her in a new video.

Both stars are at the film festival in New York to promote their movies; Cannon's basketball film Ball Don't Lie and Carey's Tennessee.

The couple made every attempt not to be spotted together at the festival. But Carey was happy to pose for photographs with a diamond ring on her wedding finger, adding to speculation she is to marry for the second time.

Carey married Columbia Records executive Tommy Mottola in 1993, but divorced five years later. Cannon called off his engagement to model Selita Ebanks last year.

See pictures of Mariah flaunting her huge diamond here.