Photo Flash: DROOD Cast, Norm Lewis, Jessie Mueller, Pasek & Paul and More Perform at Birdland

For the past ten years, Jim Caruso's Cast Party at Birdland has been the ultimate place for Broadway folks to mingle and celebrate each other, as evidenced by Monday night's jammed-to-the-walls open-mic-fest. Scroll down for photos from the starry evening!

The cast of The Mystery of Edwin Drood staged a reunion, with Tony nominee Stephanie J. Block, Bobby Creighton, Andy Karl, Jessie Mueller, and Betsy Wolfe all grabbing the mic separately and together with a live performance of their YouTube hit, "Bustle Fluffah!" Drood composer/writer Rupert Holmes then surprised everyone by singing his #1 hit, "The Pina Colada Song!" (Lucky audience members won the new Drood cast recording, too.)

Norm Lewis set hearts aflutter with a gorgeous "On A Clear Day," Tony-nominated composers Benj Pasek and Justin Paul sang from their A Christmas Story score, Marva Hicks, who plays Gladys Knight in Motown, sang one of Gladys' biggest hits, Lesli Margherita (Mrs. Wormwood in Matilda) camped and vamped "Making Love Alone," David Osmond (from The Osmonds 2^nd Generation) sang a heartfelt "Danny Boy," Broadway spitfire Natalie Hill belted a standard, and songwriter Ken Hirsch sang his Anita Baker hit, "No One In The World."

Supperclub headliner Clint Holmes and jazz superstar Jane Monheit brought some seriously swinging vocals to the proceedings, and rock star vaudevillian Marcus Monroe had the crowd screaming as he juggled five clubs while passing himself through a tennis racket! It was all just business as usual at Cast Party, which is why it's been called "the most extreme open mic in the world!"

Jim Caruso's Cast Party takes place every Monday at 9:30pm at Birdland, 315 West 44 Street in NYC.

Photo Credit: Seth Walters