Demi Lovato knows a thing or two about going to rehab, so when Selena Gomez faced troubles of her own, the singer urged her friend to get help.
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"Demi helped her find the strength to do it," an insider said. "Demi told her it's OK to be honest about having a problem."
Lovato and Gomez have been friends since childhood, and though they had a falling-out, they say they're stronger than ever.
"They've really bonded over their issues," the source said.