It seems many animated movies use famous actors and actresses to supply the voices for the characters. What is the point of that?
Most animated movies are targeted towards children, and children don't care who are supplying the voices. They probably wouldn't even recognize the celebrities' names if they saw them on a movie poster. Sometimes the celebrities' voices are altered so that even if you knew who they were, you wouldn't be able to recognize their voices during the movie (such as the chipmunk/chipette voices in the Alvin and the Chipmunks movies).
Movie studios would probably save a lot of money if they used lesser known voice talent for animated characters. So why do they frequently hire famous actors/actresses to do the voices?