Speaking with ET earlier this year, Williams said transforming into the multi-talented dancer/choreographer/singer was a challenge. "It's a lot," she confessed. "I mean, you start researching as soon as you get the part. There's like one good moment when you get the job and then the panic sets in and you go to work."
"It was pretty much, like, the longest job of my life," she added. "We just wrapped [filming] a couple of weeks ago, and we started in August. It was physical in not just the dancing, but in aging and figuring out how to physically change somebody from 29 up to 64 -- figuring out how that would affect their body."
Hear more in the video below, a click through the slideshow for more stylish looks from the Emmys red carpet.