Whose skinny arm?This star has us agape with her uber-skinny fig.

We hadn't noticed before, but she's become all bony.

Her arm, in particular, is very scrawny indeed.

The lean bod in question belongs to Desperate Housewives star Marcia Cross.

As the glam mum headed out in Los Angeles recently, we were shocked by her diddy outline.Marcia Cross

We could hardly tear our eyes away from her ultra-scraggy limbs.

Put it this way: if they were a piece of chicken, we'd be well gutted by the lack of meat.

The actress is, as ever, elegant and classy in the dress stakes.

But when it comes to weight, she should perhaps consider taking a leaf out of her co-star Eva Longoria Parker's book, and pile on a few pounds.

Otherwise we're afraid she might just be blown away by a waft of Californian wind.