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The presenter, who was standing in for usual host Lorraine Kelly, was interviewing the young actor - better known as Walford’s Ben Mitchell - when he got a little over-familiar with her.
When Fiona asked how long his days were filming on the soap, he replied: "It varies to be honest, darling."
Clearly loving the flirtation, Fiona replied: "Darling? How over-familiar! Honestly. That's lovely, I feel all young again now!"
"I can't help myself, sorry." Harry laughed.
She later added: "Oh, you're lovely! Not just because you called me darling!"
Harry was on the ITV breakfast show to chat about his latest storyline, which has seen him arrested for the murder of Lucy Beale, despite fans knowing that her brother Bobby was behind the crime.
Ben is also embarking on a romance with newcomer Paul Coker, but it's complicated as the troubled Mitchell is still in the closet and in a relationship with Abi Branning.