The Kardashian-Jenner clan is always changing up their looks, but one sister who's managed to look pretty much the same since she first burst onto the scene is Kourtney. The mother of three will be ringing in her 39th birthday on April 18 (I know, we can't believe it either!), but if we didn't know any better, we'd say she's taken a cue from Jennifer Lopez and is aging backward. Seriously, did you see her recent bikini snaps in Turks and Caicos? Regardless of how you feel about the Kardashians, I think we can all agree that Kourtney looks damn good!