The mother-of-three bid a farewell to viewers after believing the show had come to an end, until Phillip Schofield, 54, shocked her with the news there was still “two minutes to go”.
Clearly stunned, Holly turned to see what she thought was a unicorn, but was actually Celebrity Big Brother hero Tony the Pony who waltzed into the ITV studio dressed in an array of ridiculous party gear.
“Oh my god, is it a unicorn for me?” Holly Willoughby gasped. “Do I get to keep him?”
Holly Willoughby downs shots of tequila to celebrate 36th birthday on This Morning
This Morning: The funniest moments
Mon, December 12, 2016
This Morning: Laughter, tears and nudity, the most outrageous moments from the ITV show.
1 of 30
This Morning was thrown into chaos as Holly Willoughby and Gino D'Acampo took on the Christmas cocktail challenge
Oh my god, is it a unicorn for me
“It’s Tony the Pony,” squealed a particularly excitable Phillip, before the four-legged guest casually sneezed on Holly’s pink velvet shoes.
But before the presenter had time to panic over her ruined footwear, she was gifted with an almighty birthday cake, decorated with chocolate shots of tequila which she proceeded to down within seconds.
Holly, 35, also paid tribute to her “incredible” friend Tara Palmer-Tomkinson during today’s show, after she was found dead at her London home yesterday.
Holly celebrated her big day with Celebrity Big Brother legend Tony the Pony
Holly's birthday cake was laced with chocolate tequila shots
The lovable host shared an incredible story about her first encounter with the original “It” girl which involved a Chanel ring and champagne.
Holly and Phillip were also joined by Tara’s close friend Ivan Massow who suggested the socialite was in a “dark place” before her passing.
This Morning airs weekdays at 10.30am on ITV.