Christina and Demi are coming together for their new song “Fall In Line” at the Billboard Music Awards. The collaboration was confirmed after Christina release the track list for her upcoming album Liberation.

Last year, Demi told Billboard she worked with “one of my biggest idols” but said she couldn’t yet reveal who she had teamed up with. “I can’t wait for the world to hear it. It’s an incredible song.”

Kelly Clarkson will be hosting the Billboard Music Awards, which will be broadcast live from the MGM Grand Garden Arena in Las Vegas on Sunday, May 20 at 8 p.m. ET / 5 p.m. PT on NBC.