Reign Sneak Peek: Mary's Royal Wedding Dress Revealed -- But Who's the Groom?

Here comes the bride… and Amy Brenneman!

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The former Private Private practice star joins the cast of Reign this Thursday as Mary’s mother, Marie de Guise, and she’s arriving at court for a very special occasion: Mary’s wedding.

Though we can’t say which brother Mary eventually meets at the altar, we can promise the events of this episode will change the course of everyone‘s lives. (And no, that’s not just us being overdramatic.)

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Queen Catherine, meanwhile, keeps herself busy planning a somewhat less joyous event: her own funeral.

Browse all of Reign‘s Royal Wedding photos below, then drop a comment: Is Mary’s dress fit for a queen? Also, cast your vote: Which brother should get to say “I do?”