Feinstein, who had previously teamed with Cheyenne Jackson for an acclaimed cabaret gig, will sing with Cook at Feinstein's at Loews Regency Sept. 7-Oct. 2, according to the club's official website. The two singers had previously joined forces for a New Year's concert at Feinstein's.

Barbara Cook, a 2010 Tony nominee for her performance in Sondheim on Sondheim, has starred on Broadway in Flahooley, Candide, The Gay Life, The Music Man and She Loves Me. She received a Best Featured Actress in a Musical Tony Award for her performance in The Music Man, and her one-woman show, Mostly Sondheim, was nominated for a Tony in the Best Special Theatrical Event category. Cook was also seen on the New York stage in Barbara Cook's Broadway. Both Mostly Sondheim and Barbara Cook's Broadway were recorded for DRG. Cook made her solo debut at the Metropolitan Opera, which was also released on DRG Records. Her newest CD, also on DRG, is titled "Rainbow 'Round My Shoulder."

A five-time Grammy nominee, Michael Feinstein is often credited with reinvigorating interest in the American popular song. The crooner has performed in concert halls around the world and on Broadway and now co-owns his own nightclub, Feinstein's at Loews Regency. His numerous solo recordings include "The Sinatra Project," "Michael and George: Feinstein Sings Gershwin," "Big City Rhythms" "Romance On Film, Romance On Broadway," "Michael Feinstein with The Israel Philharmonic Orchestra," "Only One Life: The Songs of Jimmy Webb" and "Hopeless Romantics." Feinstein returned to Broadway this past season in the short-lived All About Me opposite Dame Edna Everage.

Feinstein's at Loews Regency is located at 540 Park Avenue at 61st Street. For ticket reservations call (212) 339-4095 or visit feinsteinsatloewsregency.com.