I just saw a commercial for the new movie Mamma Mia, that comes out July 16th in the US, and noticed that Julie Walters is in it. Julie plays Mrs. Weasley in the Harry Potter films.  She is playing the character Rosie in the film which is:

‘The story of a bride-to-be trying to find her real father told using hit songs by the popular ’70s group ABBA’.