Mariah Carey has sparked rumors 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.