There was a shocker at the end of the 55th ACM Awards, the first tie for entertainer of the year (or any major category, for that matter) in the show’s history. The co-winners were Carrie Underwood, winning in the category for the third time, and Thomas Rhett, winning in the category for the first time.Underwood is the first woman in ACM history to win entertainer of the year three times.