Demi Lovato: Kim Kardashian and Selena Gomez 'meant the world to me'

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When Demi Lovato sought treatment for "emotional and physical" issues in 2010, she also got help from some unlikely celebs -- Kim Kardashian and Selena Gomez.

The "Skyscraper" singer tells Billboard, "The people that were calling me while I was in there were Kim Kardashian and Selena Gomez. Those two girls, they meant the world to me. They still do."

"I feel like there are some people that you're friends with that talk to you on Twitter or you text, but the people that are really there for me are the people that were there for me when I went into treatment," Lovato adds.

Lovato recently released her third album, Unbroken. It's currently at the No. 4 spot on the Billboard 200 charts.
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