Justin Bieber Tweets About Letterman, While On Letterman

Justin Beiber appeared on "The Late Show With David letterman" last night and schooled the host in the ways of Twitter. Bieber whipped out a smart phone and asked if he could send a tweet from the guest chair. Letterman agreed. "Late underscore show?" Bieber asked a clueless Letterman. "It’s the Late Show. I’m Dave," the host said to laughs. Bieber told Letterman he tweeted: "I’m just hanging out with my boy Dave." Watch the clip.



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