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Christina Perri, Aloe Blacc, Earth, Wind & Fire Perform on "Christmas in Washington" Tonight 

Kevin Mazur/WireImageTNT's annual Christmas in Washington special, airing tonight, features performances by Earth, Wind & Fire, Hootie & The Blowfish singer Darius Rucker, Aloe Blacc, British pop star Rita Ora and Christina Perri.  Christina was extremely excited about the chance to participate, because Christmas music is her favorite thing ever.

"I mean, I couldn't have really said yes quick enough. It wasn't even an option," she tells ABC News Radio. "It's such an honor and so magical and Christmas is my favorite time of the year. Like, I'm obsessed with Christmas music and when I found out I could sing a Christmas song it just made so much sense. I'm just really really excited to be here." 

Christina really does love Christmas music, having released a holiday EP a few years ago called A Very Merry Perri Christmas, and the song she's performing tonight is one of the tunes she covered on that project.

"I'm singing 'Have Yourself a Merry Little Christmas.' It's one of my top five favorite Christmas songs," she tells ABC News Radio. "I wanted to do something very elegant. That's what this night is about. We're here in Washington. I wanted to wear a pretty dress specific thing I love doing is ballads, and so I just wanted to sing a really beautiful, classic, Christmas song."

As for why Christina's obsessed with Christmas music in the first place, she says, "Christmas music was the first music I ever sang. So as a child like -- when everyone says, 'When did you know you wanted to be a singer?' I don't really know the moment I decided it, but I know that when I was 3 I dressed up in a matching outfit with my brother and we sang Christmas carols for my whole family. So Christmas is always number one."

Christina normally goes home to see her family in Pennsylvania on Christmas, but she says this year will be different. 

"I'm not making it home for Christmas this year. I'm spending it with my boyfriend because he's working and would've been alone, which is a first for me," she tells ABC News Radio. "So I'm going to have a more of a romantic Christmas than I will a family Christmas. But I've never missed a Christmas before so for 28 Christmases I've been at home. So this will be my first time away, but I've definitely have sent a present for every single Perri in my family."

As for Aloe Blacc, he'll be doing "Noel" and "The Christmas Song," telling ABC News Radio, "All of the selections that I'm singing tonight are based around my favorite Christmas caroler, Nat King Cole."  The "Wake Me Up" singer, who just received a Grammy nod for his album Lift Your Spirit, says he'll be spending his holidays in Los Angeles this year; every other year, he goes to Sydney, Australia, where his wife is from.  But he says he's excited to be in D.C. for tonight's show.

"It's really an honor," he says. "It's great to be here and to get to grace the whole nation in such a beautiful time of year with these songs that we all know from our childhood." 

The show, hosted by Dwayne "The Rock" Johnson, airs tonight at 8 p.m. ET, and you'll see the first family get onstage with all the musical performers at the end and hug them.

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ABC News Radio