Motsi’s sister, Oti, won the series this year, after being partnered with former Emmerdale actor Kelvin Fletcher.
The South African dancer admitted she didn’t think the pair would win the show and said she “prepared” her sibling for bad news.
“I really didn’t think she would win to be honest,” she divulged. “Because you don’t know what will happen, I prepared her.”
Motsi will be on Graham Norton’s New Year Eve Show tonight alongside Tom Hanks, Matthew Rhys, Florence Pugh, Stephen Graham, Anthony Joshua and Mel C featuring Sink The Pink.
The Graham Norton Show airs tonight on BBC One at 10.20pm.