Wearing matching Cinderella and Prince Charming-style costumes, and riding in a horse-drawn crystal carriage, the "We Belong Together" singer and the "American Idol" judge tweeted photos and video of the celebration on Tuesday night at the southern California theme park.
"On our way to renew our vows. I love you Nick Cannon shut down Disneyland," Carey tweeted. "Celebrating our anniversary and dembabies birthday (can you believe they're 2??)."
With the Sleeping Beauty Castle as a backdrop, and in a ceremony themed "Do You Believe in Fairy Tales?," Carey, 43, and Cannon, 32, marked the fifth anniversary of their wedding with a vow renewal. That was followed by a party for some 250 guests, celebrity TV show Entertainment Tonight said in an exclusive report.
Entertainment Tonight said the reception in the Disney theme park's Fantasyland area was adorned with 15,000 blooms and 10,000 crystals.
Carey and Cannon married on April 30, 2008, and their twins Moroccan and Monroe were born on the same day in 2011.
The couple have renewed their vows every year, choosing the Eiffel Tower in Paris last year for their celebration.
(Reporting By Jill Serjeant; editing by Chris Wilson)