Despite his religious upbringing, it's apparent that Justin Bieber has no idea what the Sistine Chapel is. When 'Late Show' host David Letterman pleaded for the singer to stop tattooing his body before he started to look like the world-famous painted ceiling, Bieber insisted he wasn't shooting for the "Sixteenth Chapel" look. 

Watch Justin Bieber's Faux Pas on 'Late Show With David Letterman'