Cutting Edge: (Noun) The latest stage in the development of something.

Britney Spears' video for the song "Circus" has been leaked on the interwebs, and I don't want to give anything away, but -- spoiler alert! -- she gyrates in a lot of sheer, nude-colored outfits covered in sparkly stuff. So it looks like she's naked and covered in glitter, but she's totally not! You see, it's innovative in that it's been at least two videos since she's worn an outfit like this. Britney couldn't push the envelope any more at this point if she sent it hurtling down a flight on stairs and broke its neck.

Britney at the Rockefeller Christmas tree lighting earlier this week: