Bieber fever hits record milestone

(CNN) - He's said to be the most-followed person on Twitter, and he's hosting "Saturday Night Live" this weekend.

And now Justin Bieber has another reason to celebrate!

"The Biebs" is now the youngest artist ever to have five No. 1 albums. He doesn't turn 19 until March.

Bieber's latest album "Believe Acoustic", debuted No. 1 on Soundscan during its first week.

The pop star is now just one of a handful of artists to score No. 1 albums in four consecutive years.