Sullivan will join supermodel Emme in the June cast, performing June 1-July 3; additional summer casting will be announced soon.
The current cast includes Sonia Manzano, Donna McKechnie, Annie Starke, Freddi Walker-Browne and Rumer Willis; they will continue through April 24.
Karen Carpenter directs Nora and Delia Ephron's production based on Ilene Beckerman's book of the same name that "uses clothing and accessories and the memories they trigger to tell funny and often poignant stories that all women can relate to."
The design team includes Jo Winiarski (scenic design), Jessica Jahn (costume design), Jeff Croiter (lighting design), Walter Trarbach (sound design) and Maria Verel (make-up design).
Carpenter also directed the Monday night readings of Love, Loss, and What I Wore that were presented last winter and spring as a benefit for Dress for Success. A portion of the proceeds from the current run benefits Dress for Success.
For tickets phone (212) 239-6200 or visit Telecharge. The Westside Theatre is located at 407 West 43rd Street in Manhattan.