Olive Uniacke, 19, was unmasked Wednesday in Britain's Daily Mail. She is the daughter of Robie Uniacke, 49, and his second (and former) wife, interior designer Rose. Now divorced, Olive's father has been linked to actress Rosamund Pike, while her mom is now married to Potter producer David Heyman.
The newspaper calls Olive a Moet champagne-drinking host of fabulous house parties who also worked in a junior role in the production team of the Potter movie that wrapped earlier this summer.
A colleague is quoted saying, "Olive and Dan have been close for a long time. She was always in and out of his dressing room during filming ,and she has always been really protective over him."
Attempts to reach Uniacke's father were unsuccessful, while the mother's office said there would be no comment.