For the big ceremony, she put a modern take on a Cinderella dress in a cool blue gown ... entitled matriarch Elspeth Catton in Saltburn, alongside her co-stars Jacob Elordi and Barry Keoghan ...

In The End, Oliver Takes Down The Entire Catton Clan At the very end of "Saltburn," Oliver reveals everything to a terminally ill, bedridden Elspeth as she lies helpless in a hospital bed.