She is a staunch supporter of gay rights. And Demi Lovato managed to steal the show at a TV special celebrating the abolition of the Defence Of Marriage Act in New York on Monday. The saucy 21-year-old looked like she could hardly wait for the fun-filled Trailblazers event to start as she hammed it up for photographers at the Cathedral of St. John the Divine. She had certainly made the effort to shine, somehow cramming her curves into the black skintight Brian Lichtenberg number.Which was sheer in places and also boasted fishnet detailing around the shoulders and bust. The Unbroken favorite was far from the only big name attending the Logo TV special’s taping. Macklemore & Ryan Lewis.Pete Wentz and A Great Big World were among the other performers and presenters While it was recorded on Monday, it will air on Thursday at 9pm to commemorate the one-year anniversary of when the Defense of Marriage Act was struck down in court.Music fans were also treated to a remarkable performance from Sia who sang her new single Chandelier while backed by the New York City Gay Men’s Chorus.