Dolly Parton is bringing her twang to Vegas. The country music icon will host the 57th Academy of Country Music Awards on March 7 at the Allegiant Stadium in Las Vegas, the academy announced Thursday. “Watch for us because we’re going to have some fun,” Parton, 76, said in a statement. Parton, a 45-time nominee, previously hosted the 35th anniversary show in 2000. “We are honored to welcome Dolly Parton back to be the centerpiece of this landmark 57th Academy of Country Music Awards show at Allegiant Stadium. Dolly is the most iconic and multitalented artist of all time, and we are proud that …