Which actress plays Queen Liza?

I can't find her among the nares or so players it eh cast list but I am wondering who they have cast I teh part of the Queen of Spain, wife to King Phillipe (we aw her getting married in the first episode or two), daughter of Catherine de Medici etc. in this episode she is blonde and seen tittering with her friends as her step son runs around naked and then comes to court to demand her sister wed Martel de Guise. ideas? She looks familiar but I can't quite place her. Ps I can't believe these boards will be gone- where will I ask these questions?