We are huge fans of Jessie J here on EARMILK but even we were taken aback at just how well she killed her performance on SNL tonight. It's as though she's a 10 year veteran at live vocals and stage presence. She performed her track "Price Tag" with B.O.B and she also performed a stellar performance for her track "Mamma Knows Best". And, the latter track showcases just how wide her range is and just how much she can belt. Not sure if she even needed that microphone. Both tracks are from her debut album entitled Who You Are. Check out the performances below.