Shawn Mendes and br Miley Cyrus Could Be br Working on 'Secret' Duet The pop stars are br both set to perform at the br Grammys on February 10. Miley made her fans thinkbr they could be singing a duet br together at the ceremony. She shared a picture of br herself rehearsing in front br of some of Shawn's instruments. Eagle-eyed fans of Mendes br noticed that his name was br written on one of the guitars. TMZ reports that the pair br are in fact working on br a secret song together.