09/20/2012 at 06:00 AM EDT
And I am telling you!
surprised guests at the Hearst Corporation's 125th anniversary celebration in New York on Tuesday.
Wearing a gold lace dress
, the singer performed a number of songs including the hit "And I Am Telling You" from Dreamgirls
Gayle King, Ralph and Ricky Lauren and Mayor Mike Bloomberg were all in attendance for the event, which included a private screening of Citizen Hearst
, a documentary on media magnate William Randolph Hearst.
Chef Marcus Samuelsson catered the soiree, which included a liquid nitrogen ice cream bar.