Well, if you're female, it helps to be beautiful. An ability to act? Kind of useful. Success may also come with knowing the right people. That much has always been true. But nowadays another essential trait has been added to the list of starlet requirements. You gotta be able to kick ass. Think about it. Can you name any hot new Hollywood sensations who can’t do a leaping decapitation kick? From La Femme Nikita and Charlie’s Angels to Witchblade and Xena, the trend has been amazingly consistent. And leading the charge has been the winsome but mighty Buffy the Vampire Slayer.