PHOTOS: How Justin Bieber was left shaken after prank on Ellen DeGeneres Show
The 20-year old singer, who was recently unveiled as the new face of Calvin Klein underwear, freaked out when a lookalike model jumped out of a box wearing boxer shorts, a blonde wig and copies of the 'Boyfriend' hitmaker's tattoos while discussing his upcoming Comedy Central Roast to celebrate his 21st birthday with the chat show host.
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