The Grammy winner took the stage after the performance to help raise money for Broadway Cares/Equity Fights AIDS.
The three-time Tony winner and Stephen Sondheim collaborator will take part in the 16th season of the Platform Series.
The Honeymoon in Vegas star returns to the New Jersey theater for its 76th season celebration.
The scantily clad benefit event will take place at BPM Nightclub.
St. Louis will take over the role of Sherrie from Kate Rockwell on April 21.
David Esbjornson will direct a fresh interpretation of the classic film.
The new film will be created by Oprah Winfrey's OWN.
The production also features Patrick Wilson and Sierra Boggess.
The Pulitzer Cabaret will feature songs from Next to Normal, Rent, Sunday in the Park With George, and more.
Josh Iacovelli directs the new drama off-Broadway.