“I’m on, me, I’m on,” he shouted.
It looked as though the Emmerdale actor wasn’t happy with his limelight being stolen as he jokingly gestured for Keith to move out the frame.
However, the motion looked like something else entirely as it appeared he was making a naughty sign.
Eagle-eyed viewers were quick to notice Danny’s slip and took to Twitter to comment.
One viewer said: “Sure Danny Miller gave Keith Lemon a certain rude sign! Love it! #ThisMorning”
“What did Danny Miller just do, behind Keith Lemon’s head, on LIVE TV?” another questioned.
A third pondered: “Did Danny Miller from Emmerdale just call Keith Lemon a w****r?”
While some fans were amused, others didn’t think it was suitable viewing at midday.
One wrote: “Just watched your link to @loosewomen and when Keith Lemon was doing his thing in front of the camera Danny Miller gave the w****r sign. Not appropriate @thismorning.”
Danny was appearing on the show to discuss his role in the ITV soap, where he has been part of cast for ten years.
He praised his fellow cast-members and said the programme has been “the best drama school you could ask for”.
The panel also discussed his NTA nomination where he is up for Outstanding Serial Drama Performance.
He will be facing Eastenders actress Lacey Turner as well as Coronation Street’s Barbara Knox and Lucy Fallon in the category.
This Morning airs weekdays at 10.30am on ITV.
Loose Women airs weekdays at 12.30pm on ITV.