The America's Got Talent host has in the past talked about how much he and Carey want to become parents but neither of them opened up about the rumours while they celebrated Nick's milestone birthday.
When asked if his wife singer Mariah was expecting, he told ETonline.com: 'I can't reveal any news, but if you do get a chance to talk to my wife, ask her.'
Cannon celebrated turning 30 with two lavish birthday parties, one in New York City and and one in Los Angeles and Nick added that his 40-year-old wife knows how to throw a party.