Remember back in January when One Direction went on Sesame Street and sang a song about the letter U? The boyband reworked their huge hit What Makes You Beautiful for a new alphabet song What Makes U Useful. Genius, right?
Well now Liam Payne and Harry Styles have returned to our favourite street to sing the whole alphabet. So put U to the back of your mind and embrace the whole damn alphabet - from A all the way down to Z.
But it's not just Liam and Harry taking centre stage - Bert of Bert and Ernie fame is there too. And he sounds pretty darn great to us.