Aguilera's new colour diet!

Christina Aguilera is following a new fad diet based on the texture and colour of her food.

Pop babe Christina Aguilera is reportedly following a new fad diet based on the texture and colour of her food.

According o Femalefirst, the sexy singer is said to be rigidly following the diet in which each meal is made up of four food items; one crunchy, one soft, one hot and one cold.

The plate must also be made up of food in bold, contrasting colours.

"Christina is sticking to it religiously. She has a chef with her most of the time to whip up exactly the right meal," a source close to the star said.

Meanwhile, Christina has turned down a cameo in TheSimpsons. The blonde was offered a part in the latest series but snubbed the offer.