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We can't stop laughing at this!
You can watch a clip of the moment below:
Speaking about growing her own veg, Holly told Phil she'd had some trouble with her corn on the cob.
"I've got some good looking corn on the cob... I mean, the green sprouts coming out the top... I don't know what's happening underneath, that's the problem, I go to dig them up and there's nothing under there," she explained.
Phil, looking very confused - because corn doesn't grow underground - responded: "Corn on the cob grows off the plant though, not underneath... it's not on the root."
Bursting into hysterics, Holly said: "Does it?! Well I'm looking in the wrong place! I thought it was like a carrot!"
The pair could be seen in fits of laughter as Holly realised her mistake, with Phil adding it was no wonder his co-presenter had been struggling with the home grown veg.
And viewers at home thought it was hilarious too, with one writing: "Oh my days you have made my day. That's so funny."
While another added: "Honestly this was so funny, bless her."
And one said: "Omg..Holly Willoughby thought that the corn on the cob grows in the ground...erm..the roots do Holly...so funny."
Others said the blunder had made their day, with one adding: "@hollywills oh Holly you brightened my day, I still can't stop laughing about your corn on the cob. So classic."
"Omg!!! The funniest thing I have ever heard!!! @hollywills and her corn on the cob!!!" tweeted another.
We couldn't stop laughing at this - it certainly brightened our dreary morning!
Oh, Holly, never change! But maybe read up on your veggies.
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