The two other contestants were revealed to be Robert Webb and presenter AJ Odudu.
The remainder of the contestants have yet to be revealed but with Robert, Tom, and AJ taking part, the 2021 line-up is an impressive one already.
Tom is currently the favourite to win and Ladbrokes has tipped the star to win at 4/1, with Robert at 12/1, and AJ at 8/1.
Ladbrokes’ Jessica O’Reilly predicted: “It’s all about Tom at the top of the Strictly betting. Expectations will be high to follow in Harry’s footsteps to become king of the dancefloor, along with added pressure from wife Giovanna as the current queen of the castle.”
The One Show airs weekdays at 7pm on BBC One.
Strictly Come Dancing will premiere later this year on BBC One.