Mary-Kate Olsen by Jamie McCarthy/WireImage.com Mary-Kate Olsen by Jamie McCarthy/WireImage.com

Mary-Kate Olsen has landed a costarring role on Showtime's Weeds this season, playing Tara, a Christian girl living in the new Bible-thumping development of Majestic, and a love interest for Nancy's handful of a son, Silas. According to the Hollywood Reporter, Olsen - in this, her first major solo role sans Ashley - will appear in 10 of the 15 episodes.

Weeds creator Jenji Kohan tells the Reporter that Olsen was "absolutely charming" at her read-through, "and seemed like a great fit. Audiences have seen only one side of Mary-Kate, but here we'll see her in a whole new light." And, I'm thinking/hoping, without the mondo sunglasses.