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The rapper/producer, who produced hits like "OMG" (Usher) and "Check It Out" (Nicki Minaj), said:
"It's mean, pretty, edgy, next level. But the beat just... It's that beat. She's singing fresh over it. It's something that today needs."
He wrote via his Twitter Page:
"The song I did with Britney is gonna be crazy fresh. From the Super Bowl to the studio workin' on a mega smasher. Can't wait till it's done."
Her album, "Femme Fatale," will drop March 23rd.
Below you'll see a interview of Will.i.am briefly talking about the collaboration.