Is Sienna too skinny?

Sienna Miller’s friends are worried about her health since she spilt from Jude Law as the actress is now a size 6. Friends are concerned that the stress of her work load and the public split from Law are getting to the young actress. A source said: "Some of her friends are worried about how thin she is getting. We think her stress levels have got worse over the whole Jude thing. "Sienna's been very emotional and is finding it hard to work up any kind of appetite." "Sienna has submerged herself in the part of Edie, who was very, very slim. So she's cut out all fatty foods, including breakfast fry-ups, and is sticking to salads. She's got into the habit of eating less and smoking more. "She's not being stupid, but there's no more snacking in between meals or eating several courses." Miller has just finished filming her new film ‘Factory Girl’ in Louisiana and is living back in the UK. [Entertainmentwise]