Fresh off a show-stopping rendition of Janet Jackson's "Rhythm Nation" on Lip Synch Battle, Joseph Gordon-Levitt is showing off more musical chops via a duet with Miss Piggy on an upcoming episode of The Muppets. In the episode, Gordon-Levitt coos Frank Sinatra's "Fly Me to The Moon" alongside Piggy, swaying with swagger and singing with silky smooth dexterity - even as things go haywire behind them.