Nicole Kidman reportedly underwent a series of bizarre beauty treatments to slim down before the premiere of her latest movie "The Interpreter" here.

While staying at London's exclusive Dorchester, the Oscar-winning actress and her sister Antonia booked themselves for a range of beauty therapies, including a seaweed body wrap that claims to offer instant weight loss, says the portal Femalefirst.

"Whenever she has a big party or film premiere to attend, she has a full beauty session in the morning because it helps her relax and look her best," a source was quoted as saying.

"On this occasion, both Nicole and Antonia fancied something a bit different. As well as a facial, manicure and pedicure, both women opted for algae seaweed body wrap which helps eliminate toxins and can aid weight loss, particularly from around the hips and thighs."