BGT 2015: Simon Cowell is biggest diva backstage... but David Walliams is just as bad!

Simon Cowell (The X Factor 2014)

Simon Cowell has been named as the biggest diva backstage on Britain's Got Talent 2015.

At least that's according to Amanda Holden and Alesha Dixon.

The music mogul has been holding up the judges from starting auditions with his infamous 3PM baths.

"He's always late and we never start on time," Amanda said

Alesha agreed, and revealed: "The positive thing for me is that I get to see my daughter in the morning.

"But at the same time, I don't finish until about midnight. You feel hungover the next day. I think Simon stays in bed until two in the afternoon but I've heard he works until five in the morning - so we can let him off!"

David Walliams was also accused of having 'lots of demands' by Amanda, while Alesha claimed that his triumph in the Best TV Judge category over Simon at the National Television Awards had gone to his head.

Alesha said: "David's doing all of our heads in!

"You can't say one bad word to him without him pulling the award out or standing up and saying he's the public's favourite. He just keeps rubbing it in our face."

Speaking on the red carpet at auditions in London this week, Amanda added to us: "He even takes his award to the toilet!"

Britain's Got Talent 2015 airs on TV again from April on ITV.

Watch our interviews with the judges below!

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