And while viewers had plenty to say about the shocking announcement, they were equally as confused by glamorous Holly’s outfit.
The 38-year-old slipped into a white gown to host tonight’s show, with the bodice section of the dress turning slightly see-through under the studio lighting.
But fans were left wondering whether Holly had put on all of her outfit before heading onto the rink.
One said: “Holly has the underwear you wear before yo put on your wedding dress.”
Another joked: “Looks like Holly Willoughby has been to Ann Summers for tonight’s outfit.”
A third wrote: “Has Holly forgotten to put her top on?”
And a fourth wondered: “Has Holly forgot to put her dress on over her underwear?|
However a fifth complimented her, writing: “Holly always looks amazing!”
Holly shared another look at the magical-looking gown on her Instagram.
Racking up more than 55,000 likes, Holly posed elegantly in the flowing frock.
It featured a semi-sheer bodice, with a high-waisted skirt portion that cascaded to the floor in white ruffles.
Her ITV pal Rochelle Humes labelled her a “princess”, while Spice Girl Emma Bunton wrote: “So beautiful!”
One fan commented: “Wow! You could get married in that.”
A second said: “Wow you look amazing, have a great show.”
While a third said: “It’s beautiful and you look amazing, but it does look like a wedding dress.”
And someone else noted: “Looks like one of those dolls that shit on top of the bog brush.”
Needless to say, Holly was clearly feeling incredible in the outfit, as she also shared a video clip of her twirling in it as she grinned.
Dancing on Ice continues next Sunday at 6pm on ITV