Video: David Letterman Reveals "10 Little Known Facts About Justin Bieber"

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Justin Bieber hit The Late Show With David Letterman earlier this week to read the list of 10 things we didn’t know about him.

10 Little-known Facts About Justin Bieber were about his secret of being so adorable, about his famous hair, gas siphoning and the Green Lantern.

My favorite little known-fact about Justin Bieber is: once Biebs spent two hours in the line for his own autograph. Loving it!

In case you missed them at the show, 10 hilarious facts about Justin Bieber: