Steve Jones and Alex Jones return to host the BBC One charity fundraiser reality series, which features celebs performing popular dance routines, on Saturday, February 18.
Graham Norton, Keith Lemon and Inbetweeners star Greg Davies are the judges in the first episode.
Meanwhile, The Voice UK coach Jessie J and X Factor's JLS are confirmed as special guests.
The celebrities competing in the dance contest this week are Shooting Stars duo Angelos Epithemiou and Ulrika Jonsson, comic Terry Alderton, EastEnders stars Tameka Empson and Laurie Brett, and veteran DJs Tony Blackburn and David Hamilton.
Other stars confirmed for later in the run include Radio 1's Scott Mills, Eddie 'The Eagle' Edwards, Olly Murs and TOWIE duo Amy Childs and Harry Derbidge.
Let's Dance for Sport Relief returns on Saturday, February 18 at 7pm on BBC One.