Demi Lovato & Avril Lavigne: Y100 Jingle Ball!

Demi Lovato and Avril Lavigne pose backstage at Y100 Jingle Ball 2011 held at the BankAtlantic Center on Saturday (December 10) in Sunrise, Fla.

The 19-year-old singer shared with JustJared.com about performing with her idol Kelly Clarkson at Z100′s Jingle Ball the night before.

“She actually was backstage and she was like ‘we should sing a duet together’ and I was like ‘of course, anything you want.’ And then we basically came up with the idea to sing a Christmas carol together and it came in place yesterday. It was amazing, I was so excited,” Demi said.

“My mom,” Demi said about her hero of the year. “Because she’s been through so much and she’s overcome a lot and she’s still standing strong. She’s awesome.”

15+ pictures inside of Demi Lovato and Avril Lavigne at Y100 Jingle Ball…