The one-off special is being made as part of BBC1’s landmark sitcom season, and quite frankly, we can’t wait to see Kerry in the show.
The exciting news has been confirmed by Radio Times, and Kerry tells the website: "It's a role of a lifetime. It's so different. It's really exciting."
She goes on to discuss her love of Patricia Routledge, who played the snotty Hyacinth for five years, after making her debut as the character in 1990.
There’s no word yet on when the show will air, but filming begins this week.
TV fans will recognise Kerry from ‘Him And Her’, in which she played the formidable Laura.
She’s also appeared in ‘Doc Martin’, and on ‘Drunk History'.