The presenters, both 43, took to the stage alongside Britain’s Got More Talent host Stephen Mulhern, 42, disguised as dogs.
Hilarious: The Britain’s Got Talent viewers were left in stitches as Ant and Dec secretly auditioned for the show, during the final auditions before the live semi-finals
The trio took to the stage to perform a humorous dance routine, dancing to tunes including YMCA and Elvis Presley’s Hound dog, even getting an oblivious Amanda and Alesha to join in on the act and dance upon the judges table.
The group, named Disco Dogs, kept their identity hidden by failing to speak as they were introduced.
The rowdy routine finished with a shower of confetti and a standing ovation from the audience.
Judging the audition, unaware of who was behind the costumes, Simon said: ‘This is the sort of thing my son Eric would love.’
Disguise: The presenters, both 43, took to the stage alongside Britain’s Got More Talent host Stephen Mulhern, 42, disguised as dogs
While David stated it was ‘Pure Britain’s Got Talent’.
But after getting four yeses, or ‘woofs’, from the judges, the trio then shocked by removing the costumes and revealing who they really were.
The judges were left dumbfounded by the revelation, but viewers at home were left in stitches by the prank.
Taking to Twitter, fans rushed to comment on the ‘brilliant’ prank, heaping praise on the presenters.
It’s us! And judges Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams were left stunned as the identity of the dancing canines were eventually revealed
‘What a brilliant way to end auditions #BGT’ commented one amused fan.
While another wrote: ‘Hahahahaha I was sat here thinking what am I watching #discodogs #bgt @antanddec @StephenMulhern that’s made my night. Hilarious.’
A third watcher tweeted: ‘Lol oh I love that!!! Well done to @antanddec and @StephenMulhern for surprising the judges #BGT.’
Very impressed: Taking to Twitter, fans rushed to comment on the ‘brilliant’ prank, heaping praise on the presenters
‘Hahaha! Loved that prank Ant and Dec, and Stephen did as The Disco Dogs #BGT #BritainsGotTalent,’ remarked a fourth.
With another adding: ‘Omg!! @antanddec that audition was so funny!!! #BGT.’