During a sexy London TV performance that some say was far too mature for the sweet 16 singer, Miley Cyrus strutted around stage in short shorts as she frolicked to her new single. There’s only one problem: Cyrus doesn’t know all the words to her song.

Watch the above video to see the performance of “Fly on the Wall” - you’ll find the slip-up about one and a half minutes in. After the number was over, Cyrus flashed a grin at one of her back-up dancers and said “I forgot the words!”

Disney really shouldn’t overwork their biggest star so hard. Come on guys, let her learn the songs before she performs them.