"Beginners" helmer Mike Mills has written and will direct the film. Annette Bening, Elle Fanning and Greta Gerwig play the female leads.
The film is set in 1979. While Bening, 57, will play Dorothea and Crudup, 47, will be seen as one of her boarders.
He rents the bungalow out behind the main house. A former hippie, who now seems like a bit of slacker, with no real direction in life, he is the hunky handyman type - a skilled mechanic, carpenter, plumber and electrician - but he is got a sweet side.