Private Practice Spoiler Watch: Addison's Mother Cast?

Michael Ausiello of TV Guide chimes in on the rumor going around that Kelly Bishop was cast as Addison's mother on Private Practice. He writes:

"I hate you for getting my hopes up. I [talked to] my Private Practice moles, all of whom responded with a resounding, "False!" I should've known it was too good to be true ... particularly coming off my failed campaign to get K.B. on Gossip Girl. But at least one good thing came out of my ill-fated crusade: I got my hands on Bishop's personal e-mail address! Last week, the grande dame of Gilmore Girls sent me the nicest e-note thanking me for endorsement — and we've been exchanging e-mails ever since! I'm buddies with Emily Gilmore!"

Oh well. That would have been great. Here's hoping we get to learn more about the family life of Addison at some point in this Private Practice season.