Since leaving rehab, Britney has undergone a complete change of lifestyle

Her shrinking frame has already sparked rumours that her weight loss could be due to cosmetic surgery.

Spears was treated at Promises rehab clinic in LA in March, after shaving off all her hair and attacking a paparazzi vehicle with an umbrella.

The single star - her divorce from Kevin Federline has been settled - has two children, Jayden James, 8 months and Sean Preston, 1.