Will.i.am adds some “Big Fat Bass” to Britney Spears’ seventh studio album Femme Fatale, arriving March 29. The thumping electro-pop number takes a page out of the Black Eyed Peas’ handbook of hits, with the pop siren singing through a digital filter. “I can be your treble baby, you can be my bass,” taunts Brit on the chorus before will jumps in with a spastic verse.

“Oh my God, he’s amazing! He’s funny and he’s a charm,” gushed Britney about her collaborator, while the BEP frontman called her a “sweetheart.”

Let the beat rock below.