The GMB presenter, 46, held his head in his hands after he shocked 50 year old Susanna and the rest of the GMB cast with his blunder.
Ben, who recently shared his worries that Kate Garraway will “suffer a huge crash”, made the slip after as he was poking fun at Susanna’s green dress.
The Good Morning Britain producers had projected Ben’s face onto the dress, like a green screen.
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As Susanna joked: “Ah that’s lovely, fully clad in Ben Shephard.” While Ben added: “Susanna is wrapped in the warmth of a Ben blanket, light and airy.”
Ben’s co-host Susanna then said: “I actually quite like that look!”
Ben then made his blunder as he mixed up the word ‘nipples’ with ‘nostrils’ as he said: “My nipples are… My nipples?”
A baffled Susanna reacted to Ben’s remark with a shocked face as she said: “What?!”
The studio then burst into laughter as the camera showed both Ben and Susanna’s reaction with Ben, who replaced Piers Morgan on the show, cringing while Susanna remained shocked.
Meanwhile Dr Hillary, who was also in the studio, giggled and quipped: “We’re just [doing] surface anatomy revision this morning.”
Also in the studio was Ranvir Singh, who recently admitted she hasn’t watched Kate Garraway’s documentary. The presenter buried her head under the desk as she struggled to contain her laughter.
Ben then added: “I didn’t…” before hiding his head in his hand and muffling his laughter.
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Susanna asked: “Did your inner thoughts come out on national television to millions, Ben Shephard?”
Dr Hilary quipped: “I think it’s called a Freudian slip,” which is an unintentional error regarded as revealing subconscious feelings.
Ben attempted to correct his mistake as he insisted: “Nostrils! They’re very easily confused!” He then turned to Dr Hillary and said: “Don’t throw me under the bus!”
Susanna then added while Ben’s face was projected onto her dress again: “Nobody’s thinking nostrils anymore!”
GMB viewers were tickled by Ben’s slip-up, as one wrote: “Phahahaha @benshephard Were your nostrils exactly where @susannareid100 nipple would be?”
Another added: “Hmm yes, nostrils and nipples… Very easily confused @benshephard @GMB #GMB @susannareid100 Maybe it’s the more frequent early mornings Ben”.
As a third said: “Oh ben foot in mouth disease..thst was priceless”. [sic]