Kate Moss is planning to take a stress-management course.

The British supermodel is set to fly to Thailand with boyfriend Jamie Hince and daughter Lila Grace, six, from a previous relationship, on Boxing Day to embark on the seven-day break.

A source said: "Kate's had a hectic 2008 and feels everything's got on top of her of late. She wants to shift half a stone and totally de-stress.

"The spa she's booked in to is one of the strictest and most stringent in the world, she won't be cut any slack because of her A-list status. She's not even allowed to take her mobile phone."

Kate, 34, will check into a plush suite at the five-star medical spa, which boasts four staff to every guest and 120 treatments.

The source revealed to Britain's Daily Mirror newspaper: "She's in the hotel's top suite, overlooking the sea, so if this week doesn't sort her out, nothing will.

"She's having stress management stress management based on equilibropathy techniques. Here, the navel and stomach - the areas where stress, tension and negative emotions accumulate - are massaged.

"Kate's been told this will help her with any digestive problems which, combined with a strict vegetable and fruit detox diet, should also help her lose weight."

Kate's decision to check in to the exclusive spa comes after it was revealed she has cancelled her proposed plans to attend a New Year's Eve party in St. Tropez, in the South of France.