Britney Spears and will.i.am Listen to His Music Tweaks on 'I Am the Femme Fatale' (VIDEO)

Britney Spears took us behind the scenes of her new album with 'Britney Spears: I Am the Femme Fatale' (Sun., 9PM ET on MTV). One of the first stops was into the studio where she checked in with will.i.am of The Black Eyed Peas. The versatile artist was tweaking her song 'Big Fat Bass,' while also working on his design for a new car.

"The bass is even bigger," he quipped of the song modifications he'd made.

"He's all over the place," Britney Spears said of working with will.i.am. "His brain works in twisted ways, but he's brilliant."

When he played her the newest version of the track, Spears was delighted with the finished product. When asked if it was one of her favorite tracks, she said, "Yeah, definitely. I'm glad to have him on the album."

Britney Spears' 'Femme Fatale' dropped March 25, 2011 to mostly positive reviews and it is predicted to debut at Number 1 on the Billboard album sales chart, where it will become her sixth album out of seven to do so.