Actress Sally Lindsay, best known for playing barmaid Shelley Unwin in ITV1 soap Coronation Street, will voice a new Wallace and Gromit character.
Wallace falls in love with Sally Lindsay's character in the show
Lindsay, who left the show in 2006, will play Piella Bakewell in the 30-minute BBC One special called A Matter of Loaf and Death.
She was hand picked by creator Nick Park after he heard her on the radio.
The Oscar winner said her "colourful and characterful" voice was a "perfect match" for Wallace.
Bread enthusiast Piella Bakewell is the new love interest for Wallace
"I have been searching for a while and keeping my ears peeled since I started writing, wondering who might voice Wallace's love interest," he said.
"When I heard Sally on the radio I knew she was the one. As soon as I got home I IMDB'd her."
In the story, originally titled Trouble At' Mill, Wallace and Gromit have a brand new bakery business called Top Bun and they have converted their whole house into a granary.
As business begins to boom, Gromit finds he is landed with running the whole operation by himself as Wallace falls for Piella.
On top of that several local bakers go missing, and Gromit worries that Wallace may be next. The story is due to air at the end of 2008.