When you're a teeny bop sensation like Justin Bieber, you're constantly being watched, therefore he has to work extra hard to make sure he doesn't do or say anything stupid.
That means avoiding doing any of the following in public; swearing, skipping or having a sneak pick of the old nose. However, the singer slipped up a little when he appeared on David Letterman's late show this week.
David gave Bieber a bit of a ribbing for getting a new tattoo, which the star claims was in order of his successful, newly-released studio album. The tattoo featured the word 'Believe' (the name of the album) accross his forearm.
The interviewer teased Justin a little and told him not to get anymore to avoid making his body look "like the Sistine Chapel". To which Justin replied,
"I'm not going for the Sixteenth Chapel look" The crowd laughed along as Letterman quipped,
"Ah, Canadian high School."
While Bieber looked a little confused, aww. The singer has been making many guest appearances in the past week to promote the tour for his new album. It's been reported that the star has even agreed to collaborate with our cheeky UK lads One Direction on their next studio album.