It's a stripped down battle of the buns!
Here's Justin Bieber (19) live and unclothed during a Thanksgiving serenade to his grandma (left) ... and Harry the Prince of Wales (28) wearing nothing but the family jewels during a naked billiards party in Vegas (right).
Bieber vs. Prince Harry
WHO'D YOU RATHER?
8/12/2013 2:37 PM PDT BY TMZ STAFF
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