Pop musicians have been endorsing products as long as they've existed (who could forget Beatles toothpaste, Ricky Nelson hand sanitizer, or Enrico "The Great Caruso" Caruso-brand horse polish?), but for some reason the convergence of the two never fails to amuse (and annoy) us. Even more so when sensible boy band yelper Jesse McCartney, um, flips out his Motorola Flipout Android phone to surreptitiously film some hard working dancer's backside. Is that how a celebrity should act? We think not! Video after the break (if you really want to, that is).