(I actually wrote this yesterday I think) Margot Robbie was at the Vanity Fair after party which would explain why the Kardashian clan was hanging around, I guess they weren't at the actual Academy Awards. My bad, as the kids say.
Margot Robbie was invited because she was in Barbie and also they needed someone to stand around looking like a deer in headlights and I think the planners made a wise choice. Where's your mask, dumbo.