Emma Forbes has quit as Alan Carr's BBC Radio 2 sidekick after Melanie Sykes was drafted to fill in on the show.
Emma, 44, had taken a break to go on holiday, but her time off was extended due to the travel chaos caused by the Iceland volcano.
Melanie will co-host Saturday's show, but it is thought that after her booking had already been confirmed Emma, who was due to return the following week, expressed a desire to work after all.
Emma has been Alan's co-host on his Radio 2 show, Going Out With Alan Carr, on Saturday evenings since April last year and she is understood to have resigned on Thursday.
The mother-of-two is the daughter of actress Nanette Newman and Bryan Forbes, director of 1970s horror classic The Stepford Wives.
She started her presenting career on BBC Saturday morning children's show Going Live and went on to co-present its successor Live And Kicking, with Andi Peters.
A statement from the BBC said: "Emma Forbes has resigned as the co-host of Radio 2's Going Out with Alan Carr. We wish Emma the best of luck for the future."
A permanent replacement for Emma is yet to be found.
Her agent declined to comment.