She also appeared last week at the NYC night club Feinstein's (run by the singer, pianist and Gershwin scholar Michael Feinstein).
Here's Kitty's bio page from the Feinstein's web site.And
here's a NY Times review of her performance at Feinstein's. (Registration required.) Fair use quote from reviewer Stephen Holden:
"In remarkably sturdy voice for a performer her age, she has clearly made a pact with the angels, whose promise of a charmed life has been kept. Her one-woman show, which concludes a three-night engagement at Feinstein's at the Regency this evening, is a seamless weave of popular standards strung with gentle anecdotes about many of the theater artists she knew before, during and after her marriage to the playwright and director Moss Hart, who died in 1961."
Ya gotta love it. If only we could all get to be her age in as good a shape as she is.