He ditched the chapeau for rehearsals, emerging onstage in just a T-shirt, jeans and sneakers. He danced through the audience, pausing to shake hands with show producer Craig Zadan, saying, "Thanks for having me."
Foxx arrived in the middle of Williams' rehearsal. He quickly joined the dancers on stage, much to their amusement, pretending to stretch alongside them and offering unneeded dramatic direction.
"Walk, walk, curiosity! And retreat," he said to a chorus of laughter.
U2 also wasn't above rehearsals, running through their nominated song "Ordinary Love" from "Mandela: Long Walk to Freedom" late into the night.