The Saturdays star is among the six celebrities who will be braving the dancefloor on the festive version of the BBC1 talent show.
Fellow singer Matt Goss of 80s Bros fame, DJ Sara Cox, comedian Rufus Hound and EastEnders actor Ricky Norwood will also be learning to dance for our entertainment.
Veteran singer and stage performer Elaine Paige is the final celebrity taking part.
The partnerships for the Strictly Come Dancing Christmas Special are:
Rochelle Humes and Ian Waite
Sara Cox and Robin Windsor
Elaine Paige and Pasha Kovalev
Matt Goss and Aliona Vilani
Ricky Norwood and Janette Manrara
Rufus Hound and Flavia Cacace
The show will be hosted by Tess Daly and Sir Bruce Forsyth, and will feature regular judges Len Goodman, Darcey Bussell, Bruno Tonioli and Craig Revel Horwood.
It will open with a special Winter Wonderland-themed routine filmed at LaplandUK... We're feeling festive just thinking about it!
The Strictly Come Dancing Christmas Special will air on Christmas Day on BBC1.
What do you think of this year's SCD Christmas line-up? Tell us what you think below, as the best comment from across the website each week wins £50!