CBS has tapped Seinfeld's Julia Louis-Dreyfus to play the title role in Old Christine, a sitcom pilot about a thirtysomething divorced mom who tries to keep up with everyone around her. (Wait until she finds out she's actually 44.) Elsewhere on the pilot front, West Wing First Lady Stockard Channing has been cast in an untitled CBS comedy produced by Frasier's Christopher Lloyd and Joe Keenan, Don Johnson has been cast opposite Million Dollar Baby scene-stealer Jay Baruchel in an untitled WB legal drama and Jane Curtin, William Devane and Fred Savage have joined Crumbs, ABC's dysfunctional-family comedy. Conspicuously absent from ABC's pilot pickups thus far: J.J. Abrams' highly anticipated sitcom project starring Cheri Oteri. And no, I won't simma don na.