"When I get on that stage, I want to prove that you're never too old to follow your dreams," Williams said when it became her time to perform.
Williams' audition turned out to be a shocking striptease. It all began when she swirled her hips and sang the opening line of "Let Me Entertain You" from Gypsy.
Well, she certainly entertained everyone. The audience didn't know what to think about it, as her performance sparked reactions of laughter and applause.
The striptease progressed to Williams ripping off her red skirt and unhooking her sequined bustier to reveal shorts and tassles on her breasts that were attached to a tan-colored bodysuit. She flung the tassels in circles, and even Cowell couldn't look away.
AGT host Nick Cannon watched from backstage with his jaw touching the floor and his eyes bugging out of his head. He kept joking that Williams is an absolute star.
The judges ended up giving Williams a standing ovation. Klum admitted she loved the act and thought it was "really, really special." And Mandel and Brown agreed.
"I find you fascinating, Dorothy. I do," Cowell added. "And I do think there's an audience for you. I think we need to work a little bit more on the tassels. I kind of wanted a longer song to see where this is going to end up."
Cannon then stepped onstage and addressed the audience.
"We had a conversation backstage and Miss Dorothy told me that all she dreamed about all her life was being a star in a moment like this. I told her, 'A star is born tonight!'" said Cannon, who then explained how the judges' Golden Buzzer can send an act straight through to the live shows.
"All of our judges already hit their Golden Buzzer, but you know what? I don't care. I'm going to break the rules!"
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Cannon then took matters into his own hands and hit the Golden Buzzer himself. The gold confetti fell and everyone cheered as Williams finally received her moment in the sun.