Nick made sure that he spoilt Mariah on her special day, by presenting her with the beautiful floating butterfly bracelet on Thursday (27 March).
'Heartbreaker' singer Mariah proudly showed it off and posed for a photo with it on her wrist. Captioning the snap, Nick said: "I think she's happy..."
Meanwhile, an excited Mariah couldn't wait to give fans a look, writing: "Nick surprised me for 3/27 with a stellar diamond bracelet encrusted with 3 floating butterflies!"
Nick and Mariah, who are proud parents to twins Monroe and Moroccan, later posed for another cute photo - and Mariah couldn't have looked happier.
Nick declared: "Yep She's Happy!!!!" We agree!
Mariah returned the compliment, tweeting: "I'm just happy he's here!!!! #familytime #festivity @NickCannon."
TV presenter Nick and superstar Mariah tied the knot in an intimate ceremony on 30 April in 2008 in the Bahamas. The couple welcomed their twins three years later, in April 2011.
Sending a special birthday message to his wife, 33-year-old Nick said: "Happy 3/27!! It's officially a party!!! The love of my life @MariahCarey," before later adding: "#keeper #Angel #Unconditional #Agape #MyJoy. He who finds a wife, finds a good thing."
Monroe and Moroccan also got involved in the party celebrations and were photographed blowing bubbles in a room.
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Watch Mariah's video for 'Beautiful' below: