(FROM VARIETY) ? Julia Roberts has signed on to produce and star in Columbia Pictures’ adaptation of Margot Berwin’s upcoming novel Hothouse Flowers. Roberts will play a divorced woman who is unhappy with her job and decides to go off on an adventure. The project, which still has no script or writer attached, is on hold due to the writers’ strike. Roberts most recently appeared in Charlie Wilson’s War and she just finished shooting on the indie drama Fireflies in the Garden. Her next movie will be the Tony Gilroy-directed Duplicity, which also stars Billy Bob Thornton, Clive Owen, and Tom Wilkinson. (AP via Yahoo!)