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.
"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.