Here's some "TV News" scoop from the new issue of TV Guide magazine (on newsstands today): Kathleen Wilhoite — best remembered for her role as Dr. Lewis's nutty sis on ER — has been cast as Jess's never-before-seen mom (and Luke's sibling) on Gilmore Girls. She first appears in the Jan. 27 episode, which also marks the return of Milo Ventimiglia's Jess.