(Cover) - EN Star Style - Fergie says her glowing skin is down to her love of green smoothies.

The Black Eyed Peas singer has been looking so fresh faced lately that shes prompted speculation shes been under the surgeons knife. Shes now revealed the real reason her love of a healthy juice drink made from spinach and celery, among other ingredients.

Its not just for, you know, fitting into your dresses. Its more for your skin and overall health, she told Look.

Green smoothies were created by Hollywood nutrition expert Kimberly Snyder and include superfoods which leave people looking and feeling fantastic.

As well as spinach and celery they include apple, banana and lemon, ensuring digestion is aided and drinkers get a boost of essential vitamins. The fruit and vegetables also leave people feeling full up for longer, meaning there is less likelihood they will snack on unhealthy treats. (C) Cover Media