Justin Bieber, Boyz II Men Go "Fa La La" on Dancing with the Stars

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Justin Bieber may or may not have knocked up a 20-year old from California named Mariah Yeater.

But the artist definitely performed on Dancing with the Stars last night!

Joined by Boyz II Men, the iconic crooner debuted a new spiked haircut and sang another track off his recently-released Christmas album. It's titled "Fa La La," it's likely to make all the girls go "rah! rah! rah!" and you can watch the live performance now:

Who got voted off Dancing with the Stars this week, meanwhile? Find out now!

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Dancing with the Stars Quotes

We should have started dancing with one arm waaay before.

Cristian de la Fuente [following his injury, trip to the hospital and subsequent stellar performance]

I am not the best dancer, and I have not been the best dancer from the beginning. I am happy we made it this far.

Cristian de la Fuente