Ant and Dec have "sleepless nights" when filming prank videos for 'Ant and Dec's Saturday Night Takeaway'.

Ant and Dec

Ant and Dec

The presenting duo - whose full names are Anthony McPartlin and Declan Donnelly - are known for their joke videos on the popular ITV programme, in which they play tricks on celebrities, but have said they often get nervous before they film a segment as the "whole thing is ruined" if the unknowing celebrity catches them in the act.

Speaking about the prank they played on TV chef Jamie Oliver, which will be aired when the new series begins on Saturday (24.02.17), Dec said: "We start [working on the series] during the summer, so since last summer coming up with ideas of people we want to hit for undercovers - and Jamie Oliver is our first one for tomorrow night, and he's been on our list for a couple of years!"

To which Ant added: "We kind of messed with his day really. Got involved with the photos... and we nearly get caught.

"We have sleepless nights before those things, because if he turned round and saw us then the whole thing's ruined - all those weeks and months of planning."

And the pair, both 41, admitted to still battling with nerves before the "first show back".

When asked if they still get anxious, Ant said: "Yes. Always before the first show back.

"I'm really clumsy, and the fact I haven't fallen [down the stairs during the opening shot] in 14 years - so who knows, tomorrow could be the night!"

Meanwhile, the duo - who also present 'Britain's Got Talent' and 'I'm A Celebrity... Get Me Out of Here!' for ITV - are gearing up to celebrate 20 years of their children's television programme 'SM:TV' next year, and have said they plan to do "something" if they can get fellow presenter Cat Deeley on board.

Speaking on 'This Morning' on Friday (24.02.17), Dec said: "We are talking about maybe doing something if we can get Cat [Deeley] back from America - she's a big star out in America now - so she might come back if we beg!"

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