Las Vegas, NV -- It's fiancee versus fiance at the Academy of Country Music Awards this Sunday. Jana Kramer and Brantley Gilbert are competing for best new artist, along with Georgia Line. Garth Brooks and George Strait will perform together for the first time on the show. Taylor Swift tries for her third straight Entertainer of the Year award. If she wins, she'll be the first woman to win the award three times. Miranda Lambert is shooting for her fourth straight award for Female Vocalist of the Year. Swift is one of her competitors in that category. Lambert's husband Blake Shelton will try to repeat as Male Vocalist of the Year.