Savannah is the sister of Sienna Miller, don't you know, and Reese seemed to enjoy flicking through the racks and comically pouting to herself.

Perhaps she was frustrated because Sienna wasn't around to talk sense into.

Sienna reportedly relieved Balthazar Getty's wife of her husband while still in a relationship with Rhys Ifans.

Reese has been the victim of home-wreckery; so she understandably has some thoughts on the matter.