All you'd have to do is buy them a couple of drinks, and talk about the things that interest them for a couple of hours. Make them feel like their interests are the most facsinating things you've ever heard, and don't talk about yourself, except when making light, self-effacing jokes.
I've employed that formula dozens of times, and it's rarely failed. Of course, I've never banged a celebrity, but given time and opportunity, it could work. Theoretically, anyway.