Demi Lovato Videos: Top Singer & Model In America: Demi Lovato  gets a little flirty with her little black feather dress as she rocks out on stage at the Ocean Center in Daytona. The 18-year-old actress will be making an appearance on America’s Next Top Model on September 15th to chat about fashion and her anti-bullying campaign. Be sure to check it out! Also, check out a few videos below Demi even sings Happy Birthday to a fan in the audience. So sweet!