Late Night Highlights: Dave's iPad Tutorial, Justin Bieber's Charm and Robin's Take on ConanGate

The nation's late night hosts celebrated three glorious holidays yesterday: April Fool's Day, iPad Launch Day and Justin Bieber, who is more of a man-child with side-swept bangs than a holiday but each of his afterhours appearances should be celebrated accordingly. After the jump, the best of those celebrations as well as the other highlights you missed while sleeping off that March Madness buzz.

5. iPad-mania

Stephen Colbert has been celebrating the iPad for weeks, but David Letterman finally got in on the fun last night with a Top Ten list in honor of the new Apple product.

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