Katy Perry sang a duet with Elmo on Sesame Street that caused some controversy. To be specific, her outfit caused some controversy as it shows off more of her cleavage than was strictly necessary.
The song's actually pretty cute, if you can get past the outfit (which I must admit is an outfit I would have worn to dress up in as a kid. It's, uh, kinda ugly). Sylvia loves the song in spite of the fashion. Unfortunately, it's getting harder to find a copy of the song itself on youtube, so I'm embedding it here so nobody else has to wade through pages of entertainment "reports" on the controversy.