Natalie Dormer

Let the Game of Thrones Season 2 casting begin.

Natalie Dormer, who portrayed ill-fated Anne Boleyn in Showtime's The Tudors, has joined the cast of the HBO series, TVGuide.com has confirmed. She'll play Margaery Tyrell, who comes from a very well-to-do family, which is why she's pledged to marry Renly Baratheon (Gethin Anthony), the late King Robert's brother.

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The actress will next appear in Captain America: The First Avenger, starring Chris Evans.

The news was first reported by Entertainment Weekly.