Yep, JB will join the likes of Katy Brand and S Club 7's Rachel Stevens in putting on his dancing shoes for the one off show - and we're pretty sure he'll be nothing less than brilliant.
Although he may have to resist the urge to body pop/do any crotch grabbing - that's the sort of shiz that'll give Bruce Forsythe a bladdy heart attack.
And don't even get us started on judge Bruno Tonioli.
The festive edition of the BBC show will air on Christmas Day - and as well as featuring six new stars (including JB) will also see a group of previous contestants perform a routine together.
Well that's our after dinner treat sorted then - forget about mince pies, we want to see JB wiggle his lycra clad bum.
How about you?
Get ready by watching JLS play the sexy lyrics game. It's SEXY.