Brooke Shields, Mercedes Ruehl and Ana Gasteyer comprise one of the odder trios thus far to appear in Off-Broadway's long-running hit, The Vagina Monologues. They will commence talking on Sept. 5 and -- initiating new three-week stays in the show -- will stay with the production until Sept. 24.

Shields' previous stage work includes a highly publicized turn in Fran and Barry Weissler's Broadway revival of Grease!, in which the actress played Rizzo. Soon after her Broadway turn, Shields began her own sitcom, "Suddenly Susan." The former model's resume also includes such early and controversial credits as "Pretty Baby" (in which she played a child prostitute) and "Endless Love."

Ruehl won a Tony Award for her performance in Lost in Yonkers and an Oscar for "The Fisher King." A theatre veteran, her most recent Broadway credit was a revival of Tennessee Williams' The Rose Tattoo.

Gasteyer is a regular on "Saturday Night Live."

* The roster of actresses who have appeared in the play so far runs as follows:

Feb. 8-20: Julie Kavner, Swoosie Kurtz and Audra McDonald
Feb. 22-March 5: Mary Alice, Amy Irving and Rosie Perez
March 7-19: Rita Moreno, Cynthia Nixon and Marlo Thomas
March 21-April 2: Shirley Knight, Andrea Martin and Alanis Morissette
April 4-16: Viola Davis, Gina Gershon and Annie Potts
April 18-30: Claire Danes, Jenifer Lewis and Mary McDonnell
May 2-14: Mo Gaffney, Marsha Mason and Lynn Whitfield
May 16-28: Diahann Carroll, Judith Ivey and Marisa Tomei
May 30-June 11: Joy Behar, Hazelle Goodman and Holland Taylor
June 13-15: Linda Ellerbee, Calista Flockhart and Lisa Gay Hamilton
June 27-July 9: Melissa Joan Hart, Carol Kane and Phylicia Rashad
July 11-23: Teri Hatcher, Ricki Lake and Regina Taylor
July 25-Aug. 6: Gloria Reuben, Julia Stiles and Mary Testa
Aug. 8-20: Brett Butler, Kellie Martin and Tonya Pinkins
Aug. 22-Sept. 3: Teri Garr, Julianna Margulies and Sanaa Lathan

Joe Mantello, who staged Love! Valour! Compassion! on Broadway, is the director of the show.

$10 of each $55 ticket sold to The Vagina Monologues goes to the V Day Initiative.

For information on the Westside engagement, call (212) 239-6200.

--By Robert Simonson