Justin Bieber, Cee Lo Green and Jennifer Hudson Join Obama for Christmas Special

Wonder how the Leader of the Free World, aka President Obama likes to celebrate Christmas? According to Justin Bieber, who recorded a Christmas special with Obama on Sunday, this holiday season, Barack is just "chillin'."

Bieber joined "The Voice" host and Gnarls Barkley star Cee Lo Green, "American Idol" winner Jennifer Hudson, and Perry the Band as part of the 30th Annual Christmas in Washington concert, a fundraiser for Children's National Medical Center. The special airs Friday on TNT.

According to MTV News, the young pop icon (who has a lot to celebrate this season after seemingly beating those nasty paternity rumors) was introduced during the special by Conan O'Brien, who quipped,"It's especially exciting to be here during this joyous season, when we celebrate the arrival of a miracle child, worshiped by millions around the world. Of course I'm talking about Justin Bieber."

Before Bieber's performance of "Mistletoe" from his new Christmas album "Under the Mistletoe," he Tweeted his fans:

"Feeling good. Just had some fun at rehearsals and now we r ready. Time to sing for the President. #canadianrepresenter. Seeing the fans ... being here again 2 years later."

— Justin Bieber(@justinbieber) December 12, 2011

Later, after meeting Obama, he added:

"Feeling very #blessed and #grateful. Thank U! Great night! President Obama is one cool Prez. He told me he was 'chillin.' #PresidentialSWAG."

— Justin Bieber(@justinbieber) December 12, 2011

As fun as it is to dog on the kid, and as much fun as it was laughing about his potential baby mama drama, this has clearly been one hell of a year for the Biebs...

Watch the video for Justin Bieber's MIstletoe":