The Olsen twins got a lesson in etiquette from French Vogue on Saturday.
The fashion darlings had been invited — but neglected to RSVP — to an exclusive dinner hosted by Mario Testino, honoring Margarita Missoni and the daughters of Anna Wintour and French Vogue editor Carine Roitfeld.
"There weren't places for them because they hadn't RSVPed," says one guest. "They were refused entry at the door!"
Brandon Davis and Mischa Barton were also denied their unauthorized plus-ones.