But thats not all the sassy 90-year-old proved.
Her hips began swirling just after she sang the opening line to Let Me Entertain You fromGypsy.
Cowell was the first to give her a standing ovation, and Heidi Klum quickly followed suit.
Credit: NBC
I absolutely love you, Klum said.
That was really, really special.
You put me in a really good mood.
I find you fascinating, Dorothy.
I do, Cowell said.
And I do think theres 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.
At that point, Cannon strolled on stage and addressed the audience.
I told her, A star is born tonight!'
All of our judges already hit their Golden Buzzer, but you know what?
Im going to break the rules!
He then leapt off stage and sent Williams to furtherAGTstardom.
Watch Williams full performance below.
Americas Got Talentairs Tuesdays and Wednesdays at 8 p.m.
