Mariah Carey and Nick Cannon celebrated their five-year anniversary in a MAJOR way last night: The couple dressed up like a prince and princess (their twins, Moroccan and Monroe, had matching outfits) and said "I do" all over again at Disneyland in front to 250 guests. This continues the annual vow renewal tradition for the couple, who last year renewed their vows in Paris. As I pointed out last year: In 2010, People asked Nick why he and Mariah felt the need to say their vows ad nauseam…