For musical theater fans, the place to be on January 14 was the Pershing Square Signature Center, where original stars of Grease, Nine and Grand Hotel took the stage for a reunion concert honoring Kathi Moss and benefitting the Actors Fund. Moss, who created the roles of Cha-Cha in Grease, Saraghina in Nine and Mme. PeePee in Grand Hotel, has been battling the rare disease cardiac amyloidosis since 2011 and tuned in to see her old pals via Skype. And what a lineup! From Karen Akers to Liliane Montevecchi to Carole Demas, the stars came out to honor Moss and thrill the lucky live audience. Click through for photos from a thrilling night of friendship and song.