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Host Dermot O'Leary - who was presenting the show with Alison Hammond - appeared to have his flies undone, and viewers couldn't stop laughing.
Viewers spotted it while Dermot was trying out some chair exercises as part of a segment on keeping fit - even while you're watching telly.
One wrote on Twitter: "Poor Dermot with his flies undone doing chair exercises. Please someone tell him."
While another said: "Dermot ya flies are undone. Not that I was looking but doing the sit up and down was not that hard to miss."
And a third added: "Is dermot flies undone in his trousers lol."
Meanwhile a fourth wrote: "Dermot I think your fly is down lol."
It seems Dermot might have been told about the blunder, after he was caught laughing when the show returned from an ad break.
But when Alison asked him what he'd been laughing at, Dermot simply said he couldn't discuss it on air!
In other This Morning news, viewers were shook today when they heard Dragon's Den star Deborah Meaden swear twice in a row on during a live interview.
Alison and Dermot had to keep their jaws from dropping and quickly apologise to viewers for the businesswoman's foul language.
She said: "It's not about a question of liking someone.
"I have to trust people. I don't want to work in a business where I'm looking over my shoulder and thinking 'do i know truth?'
"So I have to trust people. I don't know if I can say bull**** but I'm going to... I don't like bull****."
Cutting in before Deborah could get any other curse words out, Alison said: "Apologies for that word."
Dermot O'Leary jokingly added: "Thanks for saying it twice."
Blushing over the mishap, Deborah said: "I shouldn't have said it twice, sorry!"
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