Leave it to Usher to come up with the catchiest alphabet song ever. The R&B performer took to “Sesame Street” to croon with Elmo, Grover, Abby and Murray Monster a jingle that teaches viewers the ABCs, and ended up making one of the best appearances on the show in recent memory.

That’s saying something, because there have been quite a few memorable “Sesame Street” celebrity appearances recently. Everyone from Jon Hamm to Henry Cavill to “Game of Thrones'” Lena Headey and Peter Dinklage have come on the show. “Sesame Street” is staying plugged into pop culture, as Cookie Monster did a great cover of Icona Pop’s “I Love It” as well.

What has been your favorite recent “Sesame Street” celebrity appearance?

Posted by:Terri Schwartz