Paul McCartney will write a song for Shrek 4, as well as sing and provide a character’s voice.
For the song, McCartney wants his 5-year-old daughter, Beatrice, to sing the vocal harmonies. It seems that the little one has musical talent and that she also loves the green ogre in particular.
According to a source, McCartney is all about the new project. "Paul is really pleased to be part of the next Shrek film because it’s Beatrice’s favourite movie. He said she can’t stop talking about it. He wants to go one step further though and make sure she’s part of the film."