Step inside, let's walk this way. Hey, television lover! Baby, let's go all night. 'The Sing-Off' (Mon., 8PM ET on NBC) returned for its fourth episode, and the theme for the show's second round was this -- "Guilty Pleasures." Sweet.
The six remaining groups hit us with some very guilty pleasures indeed, including 'Love Shack' and -- yikes! -- 'I Want It That Way.' But cult favorites 'On the Rocks' continued with their winning ways, busting out an awe-inspiring version of Def Leppard's 'Pour Some Sugar on Me' -- complete with hilarious/"sexy" choreography.
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