Do you know your ABCs? The guys from One Direction do. Mostly.
Liam Payne and Harry Styles sing the alphabet along with Bert from "Sesame Street" in a cute newly released video teasing their upcoming visit to the PBS series.
Things get off to a great start, but once the One Direction gang reaches the end of the alphabet -- it goes a bit awry.
One Direction will appear on the 45th season of "Sesame Street" this fall. Watch the teaser below: