You'll never guess who's hanging out on Sesame Street! Bert enlisted the help of some A-list pals to help teach viewers the ABC's! Harry Styles and Liam Payne teamed up with Ernie's BFF for a little acapella session. Sounds like the guys may have some competition! This isn't the first time a few of our favorite One-D members hit up the show. Earlier this year they presented the letter U with a rendition of What Makes You Beautiful.
Download the TV Guide app for iPhone, iPad and Android!