CelebritiesDirt BagCelebritiesDirt BagJay Leno Takes A Shot At Letterman, Katy And Russell Are Hooking Up, And The Spice Girls Are Back, AgainJay Leno went after David Letterman last night, dropping a few Letterman jokes in his opening monologue. "If you…ByHortense SmithPublishedOctober 3, 2009