(Getty Images)Demi Lovato and Selena Gomez have been friends since childhood and, like most childhood friends, have been through plenty of ups and downs. Though the pair weren't on great terms when Demi checked into rehab to treat an eating disorder and self-mutilation in 2010, by the time she checked out they were thick as thieves once more. Demi even told reporters that Gomez and Kim Kardashian were the only famous types who called her while she was in treatment, adding, "Those two girls...
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