Britney Spears has been killing it on Instagram as of late, between her re-posts of random nonsense and her selfies. There's something so charming about Spears' Instagram. It's like a living version of those "Stars: They're Just Like Us" magazine sections.

Like any self-respecting selfie-taker, Spears covertly takes advantage of good lighting when it appears. She posted an Instagram at a store, with a caption professing her love for boutiques. This picture isn't about boutiques, though: it's about how Spears's abs are getting sharp enough to cut through glass.