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Madonna has allegedly hit out against Lady Gaga.
According to Now Madonna calls the singer 'Lady Gag' behind her back.
A source said: 'Madonna's tired of Gaga copying her.
'She admits she's a talented songwriter but she's sick of people calling her 'the new Madonna.'.
They added: 'Madonna was annoyed last summer when Gaga rented a house in the Hamptons right near her place
'She's starting to feel like Gaga's following her and she's not at all happy about it.'