Songs such as Like A Virgin, Holiday and Like A Prayer made the singer a global name, but she admits she'd need to be paid a fortune to perform them again.
'I'm not sure I could sing Holiday or Like A Virgin ever again,' she says. 'I just can't unless somebody paid me like $30 million [£15 million] or something.'
Madge who's releasing her latest album Hard Candy on 29 April says she's a huge fan of Britney Spears.
'I love Britney Spears' new album I usually work out to her record,' she says in an interview for New York's Z100FM radio station. 'I do a combination of Pilates and dance aerobics.'
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