The actor was on-stage with the cast from his Broadway show "The Music Man" on Sunday.
Mallory Maedke won praise from "Six" fans after she stepped in for one of the musical's principal stars, who tested positive for COVID-19 early Sunday.
The actor is quickly becoming the award show guest most likely to go viral.
"Bob loved Broadway and I know the community loved him," the "Full House" alum wrote on Twitter.
The Oscar winner hailed Broadway's recent push to feature more diverse talent on stage and behind the scenes in her opening monologue.
The actors and Broadway besties delivered a chilling performance of "Touch Me" with their cast mates from the 2006 musical.
The soon-to-be talk show host made history as the third Black EGOT winner to achieve the honor.
“Pose” actor Billy Porter took to the Tony Awards red carpet to debut his latest look, which sent a subtle message about women’s rights.
The siblings took the stage at the ceremony to show their support for the musical based on their father's life.
"A Strange Loop" was named Best Musical at the ceremony, while "The Lehman Trilogy" took home the trophy for Best Play.