Thesp joins Chris Diamantopolous, Sean Hayes and Will Sasso, who play Moe, Larry and Curly, respectively.
Other notable cast members include Larry David, Jennifer Hudson, Sofia Vergara, Jane Lynch and Craig Bierko.
Production is currently under way in Atlanta.
Craig, who previously worked with the Farrellys on 2007’s “The Heartbreak Kid,” has also appeared in Universal’s “Role Models” and on Adult Swim’s hit series “Children’s Hospital.” Vanity Fair recently listed her as an Actress to Watch in its April 2011 issue.
Craig is repped by Gersh and Mosaic.