PS Can we all agree that the reason the woman walking in high heels looks so "uncomfortable" and is "barely holding herself up" is probably because she has no idea how to walk in heels? Seriously, she was wearing jeans, a thick brown belt, and a crew neck black T-shirt. Doubtful that she has spent much time in 4" heels. The Muses never walk like that in heels...then again, maybe it's because we use Insolia!
Insolia high heel inserts are not sold in many stores but you can order on the web. They are definitely worth a try.