Tony Award-nominated Legally Blonde composer O'Keefe has collaborated with Reefer Madness author Murphy on book, music and lyrics for the musical based on the biting 1988 film of the same title about a powerful clique of high school girls.

Andy Fickman (Reefer Madness) directs the sold-out 7 and 9:30 PM concerts on Sept. 13. Producers have added an additional 11:30 PM concert on Sept. 14.

As previously reported, original Legally Blonde cast member Annaleigh Ashford and Jeremy Jordan will portray Veronica Sawyer (played on film by Winona Ryder) and Jason Dean (Christian Slater in the film), respectively.

Newly added cast members include Jenna Leigh Green (Wicked) as Heather Chandler, Corri English as Heather McNamara, Christine Lakin (Reefer Madness) as Heather Duke, James Snyder (Cry-Baby) as Kurt Kelly, PJ Griffith (Mamma Mia!) as Ram Sweeney, Julie Garnye as Martha Dumptruck Dunnstock, Eric Leviton (Chicago) as Ram's Dad, Kevin Pariseau (Legally Blonde) as Kurt's Dad/Principal, Jill Abramovitz (9 to 5) as Ms. Fleming/Veronica's Mom, Tom Compton as Hipster Dork/Preppy Kid, Alex Ellis (Legally Blonde) as Goth Girl/English Teacher/Young Republicanette and Kelly Karbacz (Rent) as Stoner Chick/School Psychologist.

Producers describe Heathers this way: "The classic high school thriller features love, murder, power politics and even a little hope in the depths of an inferno even Dante couldn't imagine: eleventh grade."

Andy Cohen, J. Todd Harris and Amy Powers, in association with Sh-K-Boom Records, La Jolla Playhouse, Lakeshore Entertainment and Denise Di Novi produce the concert.

For tickets, priced $20, phone (212) 967-7555 or visit JoesPub. Joe's Pub is located within the Public Theater at 425 Lafayette Street.