© WENN / Nikki Nelson
Naked Brothers Band actor Nat Wolff has also joined the cast of director Bruce Beresford's family dramedy.
Jane Fonda, Catherine Keener, Marissa O'Donnell and Elizabeth Olsen have already been cast in the picture, reports Coming Soon.
The plot centres on a conservative lawyer (Keener) who takes her family to live with their free-spirited hippie grandmother (Fonda) in Woodstock.
Production is scheduled to begin next month in New York.
