Madonna hits out at Lady Gaga?

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.'