Luke Bryan and Florida Georgia Line will also perform on the awards show airing live on ABC. Other performers include Miley Cyrus, Robin Thicke, Shakira, Katy Perry, 5 Seconds of Summer, Ariana Grande, Iggy Azalea, Imagine Dragons, Jennifer Lopez, John Legend, Lorde, OneRepublic, Pitbull and Ricky Martin.
Lambert and Underwood will perform “Somethin’ Bad,” a collaboration to be featured on Lambert’s upcoming album Platinum, set for June 3 release.
“I’m a huge Carrie Underwood fan,” Lambert told Billboard magazine. “’Somethin’ Bad’ is a meshing of our styles, and there aren’t many female collaborations in our format, so I’m really excited to be debuting it on the Billboard Awards.”
Underwood, Ellie Goulding and OneRepublic are finalists for the 2014 Milestone Award, a fan-voted honor.