From In Living Color:
The cast gathers around the piano to wish family and viewers alike a Merry Christmas in 1992. Then, Jim Carrey queues up an original number, sung by Jamie Foxx, in one of his first musical performances on the show. Here's "This Christmas". The closing credits roll halfway through the song.
To think that 4 years later, Jennifer Lopez would be climbing the charts, and Jamie would follow some time later in a collaboration with Busta Rhymes and P. Diddy, if I recall correctly.