"We’re announcing a new celebrity castmember next week!" K.B. revealed of Veronica Mars. "Someone that’s been working on our show that we’re thrilled to have. I’m under strict orders [not to say who it is], but I’m really excited about it."

Don’t hate me but I’m also under strict (death threat) orders. However, I can tell you that this well-known actress is playing Logan’s sister and is huge in this little world we like to call "Watch with Kristin." Over the years, we’ve talked about her series more than any other show. And when you fans of this cult hit find out, you’re going to piddle a little. Promise.

If you haven’t yet caught this show, now is your chance. The first episode of Veronica Mars reairs this Tuesday on UPN. The next day you’ll find out the mystery sis. It will be magical!

For more on Veronica Mars, check out my E! News Live segment from Tuesday.