Simon Cowell joins Ant McPartlin and Declan Donnelly in a comedy spoof 'Men in Brown' segment for their Saturday Night Takeaway show.
Speaking about Simon's Acting talents, Ant & Dec joked that Simon Cowell was "atrocious" to work with as he often forgot or didn't bother to learn his lines during filming."
They were filming a celebrity masked ball where they hunt for a celebrity who was actually an alien with 'squids'.
Among the celebrities taking part are Simon Cowell, Amanda Holden, Paddy McGuinness, Hugh Bonneville, Richard Ayoade and Amber Gill.
ITV Lorraine show went behind the scenes and asked Ant & Dec whether any celebrities had surprised them with their acting and they revealed Simon had.
Ant explained: "We've worked with him for years and he's not one for learning lines or remembering lines, but he turned up today - he's like a different man!"
"He's absolutely brilliant, I don't know what's happened," Dec replied. "I think he's been taking acting lessons. He must have!"
Adding: "Maybe that's how he's lost loads of weight - he's got the squids!".
Watch the full episode Saturday evening on ITV 7pm
