Nick Cannon has an ''amazing'' relationship with Mariah Carey.

The 'America's Got Talent' star has hit back at rumours his marriage to the '#Beautiful' hitmaker is on the rocks and insists he isn't jealous about her close friendship with rapper Nas.

The 33-year-old star told Howard Stern on his Sirius XM radio show on Wednesday (02.04.14): ''Nas is probably one of the best rappers to ever do it, Howard. He's a friend of mine, he's a friend of hers. She went to his birthday party and I think I was in LA...We actually talked about this before. It'd be very difficult to make me jealous. I'm probably one of those dudes that's really secure in my relationship.''

Asked about their marriage, he added: ''It's amazing, man. We about to be six years on the 30th.''

Mariah praised Nick, with whom she has two-year-old twins Moroccan and Monroe, for giving her a diamond bracelet for her 44th birthday last Thursday (27.03.14).

She posted of a picture of them on Twitter and wrote: ''Nick surprised me for 3/27 with a stellar diamond bracelet encrusted with 3 floating butterflies!''

She added: ''I'm just happy he's here!!!! #familytime #festivity @NickCannon.''

The 'Honey' singer also marked the occasion at the 10th anniversary of the opening of the Seminole Hard Rock Hotel & Casino in Tampa, Florida, where she tucked into a giant cake and Disney-themed sweet treats.