Yesterday, late night TV show host David Letterman playfully teased Justin Bieber for getting a new tattoo. The pop star, who recently got the word "Believe" inked on his arm to celebrate the release of his new album, confessed he has "just a couple" of tattoos.

An exasperated Letterman pleaded with the Biebs, "Well, tell me that's the last one. How does that help how you look?" To which the teen heatthrob responded, "How does it not?" Reaching across his desk, the cantankerous old man pounced on Bieber's scrawny limb, trying to rub off the body art to the endless delight of audience members and Bieber's high-pitched "hey, hey, hey" squeals.

"Don't go nuts," Grandpa Dave said after the altercation, and urged him not to go and get Michelangelo's Sistine Chapel inked on his chest. Clearly unfamiliar with the greatest work of art in history, Bieber assured everyone that he was "not going for the 16th chapel." Shaking his head in disbelief while the audience guffawed in the background, Letterman sighed: “Canadian high school.”

Bieber didn't look very amused.

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