The Greatest Dancer semi final contestants speak to Newsround

Newsround has gone behind the scenes at The Greatest Dancer, ahead of this weekend's semi final.

Ricky met some of the contestants preparing for the performance of their lives, including Ellie, KLA, and James and Oliver.

There was even a surprise interruption from a star of Strictly Come Dancing!

The Greatest Dancer is on BBC One, Saturday night at 7:35pm.