BGT's David Walliams is unrecognisable as he dons disguise to prank Simon Cowell

David Walliams was up to his old tricks again on Britain’s Got Talent after he pranked Simon Cowell by pretending to be his security guard.

In an unseen clip, donned in a dashing beard, shades, a security cap and a prosthetic face mask, David protected his pal from the crowds during the BGT Manchester auditions.

As the music-mogul greeted fans as he walked down to take his seat, his security guard went to extra lengths to protect the judge.

David even carried a shield, although we are not sure what he was protecting himself from…

The comedian also put out his arm to stop audience members from touching Simon.

And just as Simon got to fellow judges Amanda Holden and Alesha Dixon, Alesha asked him: ‘Why have you got your own security?’

Ant McPartlin, who was on stage with pal Declan Donnelly went on to ask: ‘You got new security Simon?’

David then ran down to the stage as he shouted: ‘But I’m not your new security.’

He then proceeded to take off his wig and beard, as well as peeling off his face mask he added: ‘It is I, David!’

‘I would never let anyone hurt you,’ he added to Simon.

‘I felt this dark presence behind me,’ Simon said.

David continued: ‘That was me darling.’

You can watch Britain’s Got Talent on ITV Hub.

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