London, Jul 28 (IANS): Pop diva Madonna is so obsessed with her special diet that she hires a private chef to cook her macrobiotic meals whenever she flies.

The singer is so committed to her strict diet that she buys an air ticket for her chef as well so they can make her personalised in-flight food.

On a recent flight from New York to London, the 51-year-old reportedly splashed out thousands on bringing her own chef with her and booked up an entire aisle in upper class for her entourage, reports contactmusic.com.

"The cabin crew were given a dossier on rules and requirements. They weren't allowed to walk down her aisle or ask her any questions, they had to go through her assistants. It was ridiculous. She took over the whole plane," a source on board the flight has been quoted as saying.

Madonna's diet mainly comprises vegetables and fish and doesn't allow her to consume any dairy, sugary treats or processed foods.