The list of Grey's Anatomy guest stars keeps on growing.

According to EW, Shonda Rhimes has tapped both Everwood's Debra Mooney and Gilmore Girls' Liza Weil to guest star in the show's two-hour Season Five finale on May 14.

Debra Mooney will play mom to Kevin McKidd's emotionally tormented Owen Hunt, while Liza Weil will appear as a cancer patient who crosses paths with Izzie Stevens.

Interesting piece of trivia: Weil, whose sublime work as Rory's acid-tongued BFF on Gilmore Girls turned many a frown upside down, has ties to Rhimes' other show, Private Practice; her real-life husband is the equally awesome Paul Adelstein (Cooper).

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.