The sketch will air on BBC One during this year's Comic Relief on Friday 17th March.
Claudia Winkleman and comedy duo Dawn French and Jennifer Saunders will star in a celeb-filled sketch for Red Nose Day based around the hit BBC One series The Traitors which earlier this week was confirmed to be returning for a second series.
Speaking on Claudia Winkleman’s Radio 2 show, Richard Curtis revealed the sketch and announced the first celebrity name joining the roundtable will be the nation’s much-loved cook Dame Mary Berry.
In the sketch, Claudia Winkleman, played by Dawn French, assembles the celebrity ‘Faithful’ and ‘Traitors’ for a discussion full of twists and turns and viewers will need to tune in to find out which other famous faces will be under the cloaks. But who will be revealed as the ultimate Traitor?
The real Claudia Winkleman said "I can't wait for people to see this sketch. I'm so grateful to Comic Relief for putting the whole thing together. I feel like I'm in an alternate universe, and I like it."
Speaking about the sketch, Jennifer Saunders added "Worst day of my life, I don’t know why I agree to these things. The only reason why I agreed to this one was to meet Mary Berry."
To which Dawn French said "This was the second worst day of my life. The absolute worst one was meeting Jennifer Saunders. The only reason I agreed to this one was to show Claudia Winkleman the horror that awaits her in the mirror in 30 years’ time…"
And Richard Curtis adde "I’m unbelievably excited about this sketch. The Traitors is the most brilliant reality show of all time, and I hope that we can mercilessly tear it apart. There's a very impressive group of actors who gathered together to destroy the reputation of Claudia Winkleman and the BBC in aid of Comic Relief."
Comic Relief returns Friday 17th March on BBC One