Watch the Britain's Got Talent judges get hilariously pranked by this INSANE audition

The judges of Britain’s Got Talent see all sorts auditioning on their stage …

... but this act left them completely blindsided.

Three people dressed in giant dog costumes and performed as the 'Disco Dogs' to Who Let The Dogs Out by the Baha Men, Elvis Presley’s Hound Dog, YMCA and even Gangnam Style!

The insane act had the crowd dancing and cheering - and even saw beach balls and confetti fall from the ceiling as back up dancers in dog onesies made their way towards the stage.

But it turns out it was all an amazing prank.

The show's hosts Ant Parlin and Declan Donnelly were secretly the ones who auditioned and they had judges Simon Cowell, David Walliams, Alesha Dixon and Amanda Holden completely fooled.

The expressions on their faces are priceless!