Madge said to be overdoing it as she prepares for new world tour

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Doctors are said to have told workaholic Madonna to take it easy after she sustained a knee injury.

The singer is reported to have been running herself ragged as she rehearses vigorous dance routines for her Sticky And Sweet world tour.

Madge turns 50 on 16 August next month.

‘She has been feeling low and looking really gaunt,’ a source tells The Sun. ‘Madonna was told to go soft on work and rehearsals, so she will now take a proper day off every week and go easy in the mornings.

‘She has a blood analysis done every few days — including one during last Friday’s rehearsal in front of everyone.’

Madonna is now holidaying in posh New York resort The Hamptons with pal Gwyneth Paltrow, 35.