Lionel, 82, spent years working as a choreographer and it seems he has now taught 26-year-old Dappy a special routine.
The pair performed their moves in front of their fellow contestants and a video of the moment has now been shared online.
Big Brother tweeted the short clip from the show's official Twitter account, telling followers: "Lionel's found a new dance partner...#CBB."
Lionel is wearing jeans, a white shirt, waistcoat and brown boots in the film and appears to be thoroughly enjoying himself.
Dappy, meanwhile, tied his black jumper around his neck before hitting the dance floor (well, lounge carpet) with the showbiz legend.
You've got the moves, guys!
Celebrity Big Brother 2014: The full lineup
Copyright: Channel 5