The 53 year old fainted live on air.
Dressed as the Statue of Liberty in a tight emerald green dress, wig and significant head piece, Williams was presenting a segment about her Halloween costume competition when her eyes widened, she stopped talking and began visibly shaking. After stumbling back, she fell to the floor where she was immediately attended to by crew.
The show cut to an extended commercial break, and concerned shrieks from the studio audience could be heard.
After the break, Williams was back at the desk.
"That was not a stunt. I'm overheated in my costume and I did pass out. But you know what? I'm a champ and I'm back," she said.
The show issued a statement shortly after following concerns from viewers, stating "Wendy is feeling much better. She overheated because of her heavy costume, makeup and lights. She was able to finish the show in true Wendy spirit. Thank you for your well wishes."
WATCH: Wendy Williams is seriously a champ... passes out, then gets right back up and keeps doing the show after a break... whoa! pic.twitter.com/itUQ44OKOH
— Tim Young (@TimRunsHisMouth) October 31, 2017
Williams added to that later.
"Everybody relax. I'm doing just fine, just needed some water and electrolytes. On another note, I slayed and laid Halloween, LOL! Shout out to my magnificent glam squad and Ceaser Galindo the costume designer," she wrote on Facebook.
Listen: Holly Wainwright and Andrew Daddo discuss kids' limited choice of Halloween costume, on our podcast for imperfect parents. Post continues after audio.
She promised to address it in her next show, which airs later today.
The Wendy Williams Show attracts 2.4 million average viewers daily.