Show boss and music mogul Simon said all of the judges - David, Alesha Dixon and Amanda Holden - "get on really well".
However, Simon did say that he clashes with David the most, and it's no surprise, as they're always bickering on the show!
Speaking ahead of the brand new ninth series of BGT, Simon revealed: "I mean David can be a pain. I feel a little bit like Frankenstein and the monster.
"He's getting bigger and his ego is getting bigger, and he is literally uncontrollable."
Simon also said he has "high standards" when it comes to judging!
Check out what else Simon had to say in the video below, including his thoughts on dog acts, aspiring opera stars adn why there will be a lot of "magic moments" this year:
This year, the judges are once again joined by the nation's favourite TV presenting duo Ant and Dec.
The winner of BGT will secure a life-changing cash prize of £250,000 and the opportunity to perform at this year's Royal Variety Performance.
Britain's Got Talent returns to ITV on Saturday 11 April at 8pm.
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