Video! Katy Perry Mocks 'Sesame Street' on 'SNL'

Katy Perry joined the cast of "Saturday Night Live" for the season premiere as the show's musical guest, and took the opportunity to appear in a skit mocking "Sesame Street's" cancellation of her over-cleavaged skit with Elmo.

Last week, a clip of Perry performing a kid-friendly version of "Hot N Cold" with Elmo was leaked on YouTube, causing many parents to get into a tizzy over the singer's low-cut dress.

Appearing on "Bronx Beat" with Amy Poehler and Maya Rudolph, the singer exacted revenge by playing a teen who developed rapidly over the summer and was now, er, busting out of her Elmo tee.

Check out the hilarious skit.