Demi Lovato was the latest performer to take part in the 2016 “GMA” Summer Concert Series on Friday. In front of thousands of screaming Lovatics, Lovato performed “Confident,” “Cool For The Summer,” and “Stone Cold” with surprise guest Brad Paisley. All the songs are from the singer’s most recent record, Confident, which came out last fall. The concert took place at Rumsey Playfield in Central Park.