's highly anticipated sophomore release, Teenage Dream
, is available
today! Katy will be celebrating with her Live on Letterman event tonight at 8 ET/5PT where she will be live streaming a concert from the Ed Sullivan Theater in NYC. After watching the event online here
, tune in to her appearance on the Late Show With David Letterman at 11:35/10:35C. She'll also be rocking the outdoor stage at Rockefeller ...