Demi Lovato on Selena Gomez's Kidney Transplant: 'She Is a Very Strong Woman'

Demi Lovato couldn't be more proud of friend Selena Gomez for soldiering through her kidney transplant. "I think that she is a very strong woman," Lovato told PEOPLE exclusively Friday evening following a private performance in downtown Los Angeles for her Spotify superfans to celebrate the launch of her upcoming album, Tell Me You Love Me. "I'm very happy and proud of her," added the "Sorry Not Sorry" ingers, 25, who first met Gomez when they were children on Barney & Friends and became close f...