Justin Bieber's album release attendees have all the "SWAG" in the world ... with some of the biggest celebs in Hollywood pulling up to the big event Thursday night.

On his new track “Walking Away,” Justin sings, “Baby, I ain’t walking away / You were my diamond / Gave you a ring / I made you a promise / I told you I’d change / It’s just human nature / These growing pains / And baby, I ain’t walking away.”