Guys love to check out hot chicks. It's a fact. There's no denying it and it's not gonna change. Ever. But there's something to be said for subtlety. The man in this picture, apparently enamored with the back side of Paris Hilton's younger, hotter, STD-free and significantly less annoying sister, is officially busted. The kid on the right is just about as guilty. See below:

Hope your wife sees this, dude. In all fairness, this prime Nicky Hilton gawking pales in comparison to some of the other examples we've come across. At least he waited until she walked by, unlike the jackass busted ogling Sienna Miller and giving her a full-on O-Face on a London Street. Keep it together, man!