London: Lady Gaga was branded `a childish diva` by Vogue editor-in-chief Anna Wintour, according to the singer`s biographer.
The British-born journalist met GaGa back in May when she performed at Anna`s Metropolitan Museum Costume Institute Gala.
"She (Lady GaGa) sort of had a meltdown before she went on and as it was described to me, Anna was really none too pleased with her. Anna wasn`t impressed. She thought she was just behaving like a childish diva and not the professional who was about to perform for her peers; these incredibly famous designers and celebrities," the Sun quoted Maureen Callahan, author of much-anticipated biography `Poker Face: The Rise and Rise of Lady Gaga`, as saying.
"She sequestered herself in the back room for a good hour. She was late to perform and I also heard that she had been demanding things. She went to Anna at the last minute and was saying, `I`d like it to be this way. And Anna just said no. I don`t think she`s used to hearing that very often. When you`re dealing with two egos like that, it gets interesting," she added.