Roxane Mesquida Cast as Louis' Sister (and Blair's New Nemesis) on Gossip Girl

Roxane Mesquida will play Louis' sister on Gossip Girl in the upcoming fifth season of the CW drama. That will put her at odds with our heroine, Blair Waldorf.

Sources confirm to TV Line that the French actress/model is joining the cast as the meddling sibling of Blair’s regal fiance. The season begins September 26.

Short story? She's not happy with the engagement.


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