Demi Lovato Performs 'Cool Summer' In Bra Top And Gladiator Boots

Demi Lovato has a hot new song and a fierce look for summer.  The former Disney star performed her new song, "Cool For The Summer," at Z100's pool party at the Gansevoort Park Avenue in New York City on Wednesday. Lovato wore a black bra top, high-waisted denim shorts and thigh-high gladiator boots for the performance.  The 22-year-old jumped in the pool with all her clothes on to get closer with her fans, who were hanging out in the water. She posted an Instagram taken with her friends in the...