Is Britney Back To Her Old Tricks?

Sure, she could have gone back to blonde because she realized how awful the ratty brown locks looked, but when Brit squeezed into a barely there dress and made all sorts of crazy faces last night, we totally took a trip down memory lane!

Just what was Britney doing getting all hot and sweaty at a jazz club in downtown LA? I mean, where was Jason? And what's with the expressions on her face? And the sunglasses at night?

And in case you missed it before, here you go again...