Dolly Parton, legendary country music superstar, dead at 80

Country music legend Dolly Parton in 2017. NBC / Contributor / Getty Images Dolly Parton, the beloved American country music legend, has died at age 80. Her nephew, Bryan Seaver, shared the news on Parton's Instagram; no cause was given. Parton topped the Billboard country music charts 25 times and is in the Country Music Hall of Fame.  Dolly Parton — the beloved, award-winning icon of American country music — has died. She was 80.  Parton's nephew, Bryan Seaver, announced the news on her…