A posting on the official website for 54 Below reads, "Patti LuPone is ill and unable to perform at 54 Below for the remainder of her engagement tonight and tomorrow [June 22-23]. Guests who have already purchased tickets will be automatically refunded. We sincerely apologize for the inconvenience this may have caused. 54 Below will reopen on Sunday for Backstage at 5 PM."

To read about LuPone's newest concert act, click here.

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The owners of 54 Below had announced on June 17, "Andrea Martin has had to postpone her appearance at 54 Below because she is ill with a stubborn bronchial infection. We look forward to rescheduling her performance at the earliest possible opportunity. Patti LuPone has graciously agreed to change her schedule so as to continue her engagement at 54 Below for another week…"

LuPone's 54 Below engagement was conceived and directed by the venue's Tony Award-winning creative consultant, Scott Wittman, with arrangements by Joseph Thalken. LuPone is the Tony-winning actress known for creating Eva Peron in the original Broadway production of Evita, and for her work in the recent revivals of Sweeney Todd and Gypsy, among many other stage and screen roles. 54 Below is located at 254 W. 54th Street.

After training with the first class of the Drama Division of New York's Juilliard School, LuPone began her career in 1972 as a founding member of John Houseman's The Acting Company. Her select Broadway credits include Three Sisters, Women on the Verge of A Nervous Breakdown (Tony nomination), Gypsy (Best Actress Tony Award), Sweeney Todd (Tony nomination), Noises Off, The Old Neighborhood, An Evening With Patti LuPone and Mandy Patinkin, Master Class, Patti LuPone On Broadway, Evita (Best Actress Tony), The Robber Bridegroom, Oliver! and Working.

She is the author of the New York Times best-selling autobiography, "Patti LuPone: A Memoir." Read more about LuPone in the Playbill Vault.

Patti LuPone gave a sample of her show at a press event. Playbill was there.