Kevin Mazur/TCA 2012/WireImage

Justin Bieber and Will.i.am's new song is here!

The Black Eyed Peas frontman announced his new single titled "#thatPOWER," which he collaborated with the 19-year-old pop star on, earlier today via Twitter.

"This is it...its live and officially launched to the world... #thatPOWER," will.i.am, who turns 38 today, posted.

Aw! Bieber holds baby brother Jaxon

He followed it up with a pic of the song's cover art, tweeting, "The art to my next single #thatPOWER," which Bieber retweeted.

"The collaboration on this song is a doozy," will.i.am told Capitol FM of the song, which will be on his next album #willpower, out on Apr. 9. "It's a spectacular one."

Check out will.i.am introducing the song below and hear the full song on YouTube.

See Bieber's many shirtless pics (you're welcome!)