[Photos by Will Ragozzino for PMc] To celebrate Stephen Sondheim's 80th birthday yesterday, Alec Baldwin, Vanessa Williams, Jane Krakowski and Angela Lansbury attended an early performance of Sondheim on Sondheim at Studio 54.

Joining what seemed to be half the cast of "30 Rock" at the performance was Bernadette Peters, film director Mike Nichols, Sam Mendes (without Kate Winslet, obviously), and Joanna Gleason.

After "Sondheim on Sondheim" ended, Mario Cantone, Victor Garber and Lynn Redgrave helped Sondheim blow out the candles on his birthday cake at The Sheraton. During the dinner, everyone got down on their hands and knees and kissed Sondheim's feet and thanked him for years of filling their ears with pleasantries. (Fine, not really. But they should have.) Instead, some of Broadway's most prolific performers (like Bernadette Peters, Duncan Sheik of "Spring Awakening," Roger Lopez of "Avenue Q," and Michael John LaChiusa belted out some showtunes, in the name of showtunes! And really, what more could a musician ask for on his birthday, other than more music? (Just kidding. We're sure everyone was sublime. Especially B. Peters.)

Todd Haimes, Stephen Sondheim, John Weidman

Vanessa Williams                                     Jane Krakowski

Barbara Cook, Norm Lewis, Erin Mackey, Euan Morton, Vanessa Williams

Barbara Cook, Tom Wopat

Kelli O'Hara                                       Michael Cerveris, Alec Baldwin

Norm Lewis, Erin Mackey, Vanessa Williams, Stephen Sondheim

Vanessa Williams

Lonny Price, Jen Collela                               Victor Garber

Liz Larsen, Scott Ellis, Charlotte D'Ambroise

Joanna Gleason                                   Brian Yorkey

Norm Lewis, Erin Mackey, Euan Morton, Vanessa Williams, Todd Haimes, Stephen Sondheim, John Weidman, Barbara Cook

Norm Lewis, Erin Mackey, Euan Morton, Vanessa Williams, Barbara Cook, Tom Wopat