Cat clearly took heed of the warm reception her embellished Jenny Packham dress got at a recent Miu Miu party and stuck with the metallic look for her Letterman appearance.
We love the dress and the strappy sandals but there's also a tiny bit of normal-girl-style going on too. Looking at her hair, she seems to have done that thing where you hold your straighteners at a weird angle to do the top layer of hair and end up with a slight hair hump.
The television presenter was on the show to promote the US version of So You Think You Can Dance and also saw her answer the question "Can you dance?"
Apparently the answer is "No, I just host it!"