Today was one of the last times the entire cast of the Harry Potter movies will be brought together for a premiere -- and Emma Watson definitely didn't disappoint.

Watson looked gorgeous in a full-length Oscar de la Renta gown as she hit the red carpet for the big premiere of "Harry Potter and the Deathly Hallows - Part 2" -- proving her style has definitely matured since the first time she walked a red carpet 10 years ago for "Sorcerer's Stone."

Co-stars Daniel Radcliffe, Rupert Grint, Ralph Fiennes, Helena Bonham Carter, Alan Rickman, Tom Felton, Bonnie Wright and many many more all came out to the big event at Trafalgar Square, where they all took time to sign autographs and pose for photos with the wild fans in attendance.

Some of the cast, including Emma, will also hit the carpet again next week for the NYC premiere on Monday.

The movie opens July 15 -- check out some sneak peek clips here and be sure to enter to win a "Deathly Hallows" prize pack here!

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