Robbie Williams, George Michael and Michael will perform live on Britian's X-Factor with the three finalists. Williams is set to perform with Olly Murs, Michael will sing with Joe McElderry and Buble will collaborate with Stacey Soloman.
Check the ITV X Factor (UK) local television listings for times and channels.
Don't forget to tune into Jennifer Hudson's Special, "I'll Be Home For Christmas", which features a performance by Michael. It airs December 14th on ABC.
And on Christmas eve, CBC's The Hour Holiday Music Special is showcasing the Talents of Michael, Our Lady Peace and other Canadian Stars.