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Mariah Carey, Jimmy Fallon

LATE NIGHT WITH JIMMY FALLON -- Pictured: Mariah Carey joins Jimmy Fallon & The Roots singing a special rendition of her self-penned #1 holiday classic "All I Want For Christmas Is You" using classroom instruments. The Roots (l-r) Questlove, Damon "Tuba Gooding Jr." Bryson, James Poyser, F. Knuckles, Captain Kirk Douglas, Kamal Gray, Mark Kelley -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank)

Top Shots of the Week

Miss any of this week's most memorable celebrity moments like Katy Perry and Jack Nicholson sharing a smooch, or some TV stars lighting a Christmas tree with the Obamas? Check out omg!'s Top Shots!