“Poor me!” Gemma wrote on the clip, alongside a laughing emoji “@gorka_marquez @grazianodiprima.”
Other celebrities performing in the Christmas special include Debbie McGee, who will be dancing with Kevin Clifton, after previously reaching the 2017 final with Giovanni Pernice.
Joe Sugg is making a return from entertaining fans on the show last year and will be back with his partner and now girlfriend, Dianne Buswell.
Other partnerships include Chizzy Akudolu, who will be dancing with Italian dancer Graziano, Mark Wright will be performing with Janette Manrara and Richard Arnold will be dancing with Luba Mushtuk.
Strictly Come Dancing continues Saturday on BBC One at 7.00pm and Strictly Come Dancing Christmas Special will air on Christmas Day at 4.40pm on BBC One.