It looks like Mischa Barton doesn't have an eye for fashion ... or a clue about manners.

The former (now deceased) star of The OC somehow finagled an invitation to Kensington Palace in London in order to dine with Lord Frederick Windsor, son of Prince Michael of Kent, who's a cousin of the Queen's. (Got all that?)

However, Barton reportedly raised royal ire - and not just because she refused to eat anything. The actress was tapping away at her Blackberry throughout the meal.

Lord Windsor was displeased by the display. While Barton's rep had no comment about the incident, suggest that the good Lord simply steals Mischa's Blackberry password as revenge.

It seemed to work with Paris Hilton and Lindsay Lohan.