Justin Bieber delivered an early Christmas present on Friday, in the form of a leaked holiday album featuring some heavy-hitting talent. Bieber collaborates with Busta Rhymes for “The Little Drummer Boy,” Mariah Carey on a new version of a song she already covered to perfection, “All I Want For Christmas,” and Boyz II Men on “Fa La La.”

Bieber fans who melt at the sound of his high-pitched voice have another surprise coming to them. “Vocally, his balls have dropped,” Bieber’s manager Scooter Braun told Billboard Magazine. That means, on “Fa La La,” it’s hard to tell the boy from the men.

Guess it was only a matter of time before Bieber, now 17, went from falsetto to baritone. At least his transition appears to be going smoother than Peter Brady’s.

(Photo: Raymond Braun Media Group)