Mariah Carey kicks off Xmas concert series on a high note...

Queen of Christmas returns!
Mariah Carey kicked off her 'All I Want for Christmas Is You' concert series in Vegas last night (photo).

Her triumphant return to The Colosseum at Caesars Palace served as a real festive treat to fans when she performed a flourishing rendition of 'Joy to the World.' Her vocals were really nice and she was definitely in that spirit of thangs.

This we like to see daaahliiing!

For the nostalgia: