Back in 2012, he lifted the Glitterball trophy on Strictly Come Dancing with his dance partner Flavia Cacace.
Louis battled for the win against his fellow contestants Kimberley Walsh, Denise Van Outen and Danni Harmer.
Elsewhere this evening, Bonnie Langford, Howard Donald and Tamzin Outhwaite were all unveiled as the remaining mystery celebrities.
Catch up on The Masked Dancer on the ITV Hub.
