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Madonna has sparked fears her turbulent personal life is taking its toll on her health.

The ‘4 Minutes’ singer - who is currently rehearsing for her forthcoming world tour - has reportedly fired two dancers, while her tour manager is allegedly threatening to quit due to her “spectacular mood” swings.

Madonna has been rocked by claims her marriage to Guy Ritchie is on the rocks and by allegations she is having an affair with baseball star Alex Rodriguez.

Her brother Christopher released a tell-all book about her last week, which is said to have devastated her.

A source close to the singer revealed: “Madonna is doing less than OK. She has been rehearsing for the tour and she is totally miserable. She’s down physically and mentally. The situation with Guy is very, very tense. The way everyone is going crazy with the A-Rod story, her brother’s book and her physical exhaustion are all taking their toll. She feels nobody has taken her side. One of her closest pals says she has never seen Madonna so low. She has been feeling down and looking really gaunt.”

As Madonna struggles to cope with the stress, she has been diagnosed as anaemic and the usually super-fit star has suffered a knee injury. Following her knee injury, doctors have ordered the 49-year-old to take a break and she is reportedly staying with close friend Gwyneth Paltrow at the Hamptons resort in New York. Medics have advised she lessens the strain of her dance routines when she does return to rehearsals.

The source added: “Madonna was told to go soft on work and rehearsals, so she will now take one proper day off every week and go easy in the mornings. She has a blood analysis done every few days - including one during last week’s rehearsal in front of everyone.”

Chris Martin is on a diet. The Coldplay frontman revealed the whole band has been forced to swap tasty ‘baked goods’ for salads after they piled on the pounds while working on their new album ‘Viva la Vida or Death and All His Friends’.

Chris said: “It happens whenever we have some downtime, usually between albums. We get very hairy and kind of morph into Bill Oddie (British TV presenter) – we have stacked on the weight.”

The singer revealed he decided to do something about his weight after receiving weight loss advice from an unusual source – Primal Scream bassist Mani. Chris added: “Mani was eating a sandwich and I asked him what was in it. He told me it was salad and that I should eat the same. Mani warned us that nobody wants a fat pop star.”

Chris has now banned calorific club sandwiches from their catering menu while they are on tour promoting their new album.

A source said: “They love club sandwiches and know they would be tempted to eat quite a few if they were available.”