I really, really love a Kim Kardashian throwback photo, particularly when it harks back to the early '00s, those heady days of smoky eyes and Ugg boots and close personal friendships with Paris Hilton. And Kardashian is a generous provider: On her Instagram story Tuesday, she shared two incredible photos to mark Hilton's 39th birthday. Those outfits! The sunglasses! That lipgloss! Perfection!