Sienna Miller fights like a man in her new film. The British actress claims she and co-star Rachel Nichols have a "brutal" brawl in the upcoming action movie "G.I Joe: The Rise of Cobra."

Sienna, 26, said: "Rachel and I have one of the toughest girl fights I think people will ever see. I mean, it's chains and it's brutal, nasty, dirty fighting - proper boy fighting, but between women."

Cate Blanchett is rumored to replace Sienna Miller in "Nottingham." The "I'm Not There" actress is expected to take on the role of Maid Marian in the heavily-delayed film which takes an alternative look at folk hero Robin Hood.

Actor Mark Strong, who is believed to be playing one of the chief villains in the film -Sir Guy of Gisbourne - said: "I think Cate Blanchett is set to take the Maid Marian part. She is a wonderful actress and it would make it a much classier film if she was in it."

Kirsten Dunst is reportedly dating Josh Hartnett. The couple - who have been romantically linked several times over the last year - have further fueled rumors they are together after they were seen enjoying an intimate dinner at Blue Ribbon Sushi in New York on Thursday.

A source said: "They were whispering and smiling at each other. At times it looked like she wanted to grab his hand, but stopped. She was especially smitten with him."

Sienna Miller has been criticized for her unruly hair and bad teeth. The actress appears in "The September Issue," a documentary following U.S. Vogue editor Anna Wintour as she puts out the September 2007 edition of the famed magazine, and shows staff despairing over their cover star.

The documentary debuted at the Sundance Film Festival this week and one viewer said: "It must be awful for Sienna to see. Anna keeps complaining she is too 'toothy' and the other staff are worried she has too many fillings."

Sienna Miller and Balthazar Getty want to star in a film together. The "Factory Girl" star - who was recently reunited with the married "Brothers and Sisters" actor following a brief split - hopes working together will win over critics of their romance.

A source told Britain's The Sun newspaper: "Her advisers are warning how unpopular that would be."