One Direction plus Sesame Street equals the most adorable ABCs rendition ever! Harry Styles, Liam Payne, Louis Tomlinson, Niall Horan and Zayn Malik recently filmed a bit for the famous kids' show. In a little clip for their appearance, Harry and Liam sing the alphabet with Bert. The three sing from A to Z before belting out a giant finale with, "Now we know our ABCs, next time won't you sing with meee!" Then, all five guys sing their hit song "What Makes You Beautiful" with the lyrics changed into an educational lesson about the letter U.