Director Lars Von Trier (L) and cast member Kirsten Dunst arrive on the red carpet for the screening of the film "Melancholia" in competition at the 64th Cannes Film Festival, May 18, 2011.[Photo/Agencies]

Kirsten Dunst won best actress in Cannes on Sunday for her role in "Melancholia," directed by Denmark's Lars Von Trier who was thrown out of the film festival for joking he was a Nazi and Hitler sympathiser.

The 55-year-old film maker, a winner of the top Palme d'Or award in 2000 for "Dancer in the Dark," has been banned from coming within 100 metres of the festival site where the awards ceremony brought a curtain down on the May 11-22 event.