Eliza Dushku might actually be a vampire.
The actress played bad-girl vampire slayer Faith on Buffy from 1998 to 2003, but hasn't aged a day in the last 13 years. Just look at that dark lip, wife beater AND tattoo. Bad to 1998's bone:
We first met her in season three and has not only found the fountain of youth, but has enjoyed a relatively successful post-Buffy career. After the show wrapped, she nabbed the lead in two shows - Tru Calling and Dollhouse - but both were short-lived, but maintain cult status. Sure, she was only 22 at the time and she's still only 35 - but excluding a slightly darker hair colour, you'd be hard pressed to spot the difference.
She slayed (pun very much intended) on the red carpet for the series four premiere of Banshee, in which she features. But she'll always be Faith to us.