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The pair recently signed a £40 million deal with the channel, much to the disdain of Cowell, whose contract is worth just half of that.
Dec told The Sun: "We were filming Britain's Got Talent and came into the studio the morning The Sun broke the story (regarding their contract) and the audience gave us a standing ovation.
"We were on cloud nine, but Cowell just turned around and he was steaming.
"He hissed, 'You've curdled my milk, you've soured my apple.' He was so unhappy. Simon can't bear the thought of anyone being paid more than him."
