Here are performances from "Glee" star Amber Riley, "American Idol" runner-up and Broadway actress Diana DeGarmo and Evita's Rachel Potter, among others.
Happy Holidays!
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Idina Menzel
Cyndi Lauper and the cast of Kinky Boots
The Broadway Boys:
Diana DeGarmo:
Rachel Potter:
Amber Riley from "Glee":
MJ Rodriguez from Off-Broadway's Rent:
And, of course, Mariah Carey: