The funnyman has been friends with Bowie since they filmed a sketch together for charity show Comic Relief earlier this year, so he is hoping the legendary singer will agree to send himself up on 'Extras'.
Meanwhile, Ricky approached Chris - who is married to Hollywood actress Gwyneth Paltrow - when they met at this summer's Live 8 concert in London.
If they agree to take part, the musicians will join a long list of A-list stars to poke fun at themselves in the sitcom, which has been nominated for a record five British Comedy Awards.
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