Britney Spears sang "You Oughta Know" at her Greensboro, North Carolina, concert on Saturday.

Britney is not known for singing live, she usually lip synchs throughout her entire shows, therefore many bloggers busted a nut over this. Although I'm Team Britney, I'm not going to say that she sounded "really good." She's a SINGER, she's supposed TO SING. And that's what she did!

Most blogs posted a grainy, poorly filmed video but this shiz is high definition, baby. You only see Brit's backside for the first verse but after that it gets much better.