Singer Christina Aguilera, who recently flaunted a trim look at an awards function, has been following a special diet which is keeping her in shape.

She follows a Fresh Diet premium meal plan, which features meals amounting to a maximum of 1,600 calories a day, reports a weekly magazine.

"She did it all on her own. She goes online and picks out her food,” the magazine quoted a source as saying, reports a website.

The 32-year-old is also reportedly passionate about yoga, and the lifestyle change has helped her drop an estimated 20 pounds.

(Agencies)