The American blues, folk and country singer Bonnie Raitt scored an unexpected Grammy on Sunday for Song of the Year, an honor for her track "Just Like That."

The critically acclaimed 73-year-old jumped ahead of pop titans Beyonce, Adele and Taylor Swift to take home the prize honoring songwriting.

"I'm so surprised," Raitt said in accepting the prize, after she walked to the stage with her jaw dropped open in shock