Lynch will play Laurel, a fortysomething, pot-smokin' hottie who has a whirlwind romance with Matthews (Ryan Eggold). She has quite a history under her belt, as evidenced by her colorful stories about various rock stars and celebrities.
There is, of course, more to Laurel than at first appears. She's also the mother of one of Matthews' students.
Lynch, 50, rocketed to fame playing a heroin addict who turns to crime in 1989's Drugstore Cowboy (opposite Matt Dillon). More recently, she played a villain in the first Charlie's Angels movie and a "drag king" on Showtime's The L Word.
Lynch is confirmed for one episode, which airs in January, but is likely to recur on the show.