One of the world's most famous ballerinas is joining Strictly Come Dancing.
She's called Darcey Bussell. But she won't be on the dance floor - Darcy's going to a fifth judge for the rest of the series.
She says she's going to be tough and won't be afraid to tell the contestants what she thinks about their moves.
Darcey is a big Strictly fan, and performed a special routine on the show two years ago.
So what is Darcy going to be looking for the contestants to do?
"I want to see them travelling, using the space and stretching themselves that little bit further than maybe they should," she said.
Darcey was the Royal Ballet's youngest ever lead ballerina. She retired from professional dancing in June 2007.