Where is her liver?

Whenever I see an extremely thin woman, especially a fashion model, I ask myself, "Where in the world is her liver?"
I know that the liver is the biggest internal organ and has four lobes. It seems to me it needs a lot more room than what is available in a pencil-thin person.

Just thinking outloud. I'm off to help with my 10 month old twin grandchildren for a couple of days.

(photo of model: MSNBC; diagram of torso: Geocities)