(sfgate.com) -- The stars of "Harry Potter" caused chaos on the streets of London on Monday night, when they stopped traffic to film scenes for the latest movie. (Click here for pix.)

Daniel Radcliffe, Emma Watson and Rupert Grint were all on-set in the U.K. capital to shoot an action sequence for the first installment of two-part film "Harry Potter and the Deathly Hallows," which is due for release next year.

The actors, along with 400 extras, took over London's famous Piccadilly Circus and the surrounding roads to film scenes in a cafe and on the streets.

Watson, who plays clever Hermione Granger in the wizard franchise, was wearing a glamorous red dress and heels, while Radcliffe and Grint, who play Harry Potter and his best friend Ron Weasley, both donned smart suits for the scenes.