Whose skinny behind?Whose skinny behind?This lady has got her fans concerned over her recent rapid weight loss.

Her bum alone is absolutely teensy...

It's missing any suggestion of fleshy bounciness.

It's just scragginess through and through.

So it's perhaps no surprise that people are speculating whether this American party gal has an eating disorder...

Allegations she herself has come out and denied.

It's true she does have a slim frame ordinarily - but she's skinnied down rather a lot of late.

Come see whose derriere shrinkage we're on about, by clicking in the gallery below.