Actor/singer David Hasselhoff made a surprise appearance on TV talent show American Idol on Wednesday (25Mar15) to perform a medley of hits from the 1980s in honour of the competition's 80s-themed night. The former Baywatch star sang such songs as Queen's Crazy Little Thing Called Love, Walking on Sunshine by Katrina and the Waves, Never Gonna Give You Up by Rick Astley, and David Bowie's Let's Dance.