Britney Spears hit the red carpet for Whitney Houston's tribute concert last night, and the X Factor judge couldn't wait to talk about her upcoming single "Scream & Shout" with

We couldn't believe how normal she sounded. Yep ... and OMG moment!

When asked about her new song, Brit said:

    “Well, you just have to hear it. [] is a radical genius/scientist in the studio. He knows what he’s doing. Just to be able to do a song with him is fun."

Can't wait to hear Brit and Will gettin' busy on the airwaves.

Back in 2007, Ms. Spears seemed like an entirely different person when she chatted with an X17 photographer. What a difference 5 years makes!