Michael Underwood surprised This Morning presenter Phillip Schofield and the show's viewers on Tuesday as he shared on the programme that he is now a teacher.
Underwood, who is known for presenting stints on CBBC as well as CITV, appeared on the show from the school he works at to promote a children's writing competition alongside TV star wife Angellica Bell.
Schofield remarked: "Michael, I had no idea. You're a teacher! Are you at school now?
"I am at school right now, my class is here," Underwood, 44, confirmed before turning the camera round to his pupils. "Say hello, boys."
Michael Underwood attending the Royal Television Society Programme Awards at Grosvenor House Hotel, Park Lane, London.
Michael Underwood attending the British Academy Games Awards at Tobacco Dock, London.
Presenters Michael Underwood (left) and Jenni Falconer present Lucas Pope with the Strategy and Simulation award, for Papers, Please at the British Academy Games Awards at Tobacco Dock, London.
British astronaut Major Tim Peake (right) on stage alongside presenters Angellica Bell and Michael Underwood (left) at the Farnborough International Airshow in Hampshire.
Angelica Bell and Michael Underwood attending the launch of the Virgin Active London Triathlon, at Virgin Active Chiswick Riverside in west London.
Michael Underwood arriving for the premiere of Real Steel at the Empire Leicester Square, London.
Michael Underwood and Angelica Bell attending the Jeans for Genes launch party at Kettner's in central London.
Lauren Pope (l) and Michael Underwood in the parade ring at Sandown Park
Michael Underwood and Angelica Bell arriving for the 2011 Brit Awards at the O2 Arena, London.
Angelica Bell and Michael Underwood arriving at the National Television Awards 2011, the O2 Arena, North Greenwich, London.
Copyright Doug Peters EMPICS Entertainment
Michael Underwood arrives at the premiere of The Last Seven, held at the Odeon Covent Garden in central London.
Angelica Bell and Michael Underwood arriving at the UK Gala Premiere of Salt, Empire Cinema, Leicester Square, London.
Michael Underwood and Angellica Bell arriving for the BAFTA television awards at the London Palladium.
Michael Underwood and Angelica Bell arrive for the ITV daytime television party in London's Covent Garden.
Michael Underwood and Angelica Bell arriving for the 2009 Inside Soap Awards at Sketch, Conduit Street, London.
Angelica Bell and Michael Underwood at the Ralph Lauren/Sony Ericsson WTA Tour pre-Wimbledon Party at the Kensington Roof Gardens in London.
Angellica Bell and Michael Underwood arrive at the Digital Spy Reality TV Awards at the Bloomsbury Ballroom, in London.
Michael Underwood in practice ahead of Dancing On Ice, which airs on ITV, at the Natural History Museum, London.
Holly Willoughby with her 'Ministry of Mayhem' co-presenters Michael Underwood (left) and Stephen Mulhern arrive for the British Academy Children's Film and Television Awards, in association with the LEGO Company, at the Park Lane Hilton in central London.
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Explaining his career move, Underwood shared: "At university that's the degree I did, a teaching degree, originally."
After moving into television once he graduated, Underwood worked in children's TV and acted as host for shows such as The Big Bang, Jungle Run and Ministry of Mayhem.
He told the hosts he returned to teaching when "work was quiet" for him while Bell was "flying in her career".
"I started to think about using the skillset that I've developed over the years and put it into something like teaching. I decided to go for it," he shared.
Schofield wasn't the only one who wasn't in the know as This Morning's Lizzy Cundy also shared her surprise at Underwood's new profession.
She tweeted: "My old buddy Michael Underwood is a teacher !!! Wow I never knew !! Incredible !! And what a great competition 500 words #ThisMorning."
Fans at home were taken aback by the news too, as one remarked: "Michael Underwood is now a teacher?! #thismorning."