Britney Spears knows how to deliver a compelling Instagram post. It’s a pretty easy formula, really. Britney Spears plus a bikini plus anything. In this particular instance, the “anything” is Cyndi Lauper’s classic song “Time After Time.” Which you will now have stuck in the back of your head for the rest of the night. But I have a feeling you won’t really mind. Enjoy.

Taylor Swift wore a floral corset top on Late Night with Seth Meyers, showing off her stunning dress. The pop…