PHOTOS: Mariah Helps Nick Celebrate the Big 2-9 in Sin City

You wouldn't know just by looking at them, but there's a gap of just over 10 years separating husband and wife Mariah Carey and Nick Cannon. Perhaps that's why the 39-year-old beauty seemed so happy to celebrate Nick's 29th birthday over the weekend at The Bank nightclub inside The Bellagio in Las Vegas. At least now, their ages both end in the same digit!