Christina Aguilera and Demi Lovato to Perform at 2018 Billboard Music Awards The dynamic duo will perform their new song “Fall in Line” at the ceremony on May 20. The track will be the second single from Aguilera’s upcoming album ‘Liberation.’ Last year, Lovato teased fans about the collaboration. “I can’t wait for the world to hear it. It’s an incredible song.” Aguilera, 37, recently released her R&B single “Accelerate,” with features from Ty Dolla $ign and 2 Chainz. ‘Liberation’ will be the singer’s first album in six years. Other performers slated for the award show are Shawn Mendes, Camila Cabello and Dua Lipa. The 2018 Billboard Music Awards will broadcast live on Sunday, May 20 at 8 p.m. ET/5 p.m. PT on NBC.