Justin Bieber shows off his new tattoo on "David Letterman"!

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JB's brand new ink -- revealed!

Hey M Girls!

This week, Justin Bieber was on "David Letterman" and showed off his new tattoo! Check out the video below:

Let's dish: -What do you think of the "Believe" tattoo on Justin Bieber? Do you agree with David Letterman that you shouldn't go tattoo-crazy?

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