Joe Jonas explains why he's 'so happy' for Demi Lovato Pop star Joe Jonas has heaped praise on Demi Lovato, his ex-girlfriend. 11 May 2026 Joe Jonas thinks Demi Lovato is "crushing it" at the moment. Joe Jonas has heaped praise on Demi Lovato The 36-year-old pop star recently made a surprise appearance during Demi's It's Not That Deep tour in Orlando, Florida, and Joe is full of praise for Demi, observing that her show is "amazing". Joe - who briefly dated Demi in 2010, after they starred together in the film Camp Rock - told People: "I'm so happy for her. She's crushing it.