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    Kristen Stewart and Robert Pattinson Part Ways to Party!

    Kristen Stewart, Robert Pattinson WeirPhotos/SplashNews; O'Neill/White/INFphoto.com

    Perhaps Robsten were heavy on the PDAs Sunday night at the MTV Movie Awards afterparty because the hot-and-heavy couple knew they would be parting ways so soon?

    While Robert Pattinson arrived back in Toronto on Monday to resume filming Cosmopolis, Kristen Stewart was spotted in London last night partying with her On the Road costars Garrett Hedlund and Tom Sturridge, who also happens to be Rob's BFF.

    But who was the notorious Hollywood party girl also in attendance?

    RELATED: Robert Pattinson & Kristen Stewart Post-MTV PDA: "He Couldn't Keep His Hands Off Her"

    Sienna Miller!

    Miller has been spending a lot of quality time out and about with Sturridge these days.

    So since Tom and Sienna are hooking up, does this mean Robsten will be hanging with the party-lovin' duo?

    While Rob got back to business up north, his GF, BFF and their crew dined at the St. John Hotel in London before heading off to the Groucho Club where the group were photographed exiting late at night. This is so hard-core Kate-and-Wills-style living, love it.

    And we doubt K.Stew and Sienna were sitting inside the club having tea and crumpets and bonding over their respective Vogue covers.

    No, this group likes to have fun!

    What do we think? Are K.Stew and Sienna going to become Hollywood's new BFFs? Is Kris going to trade in her hoodies for Sienna's fur vests?

    Um, no, let's hope not.

    But despite the group's drive to party, at least Rob can rest easy from Canada knowing that his old pal Tom is there to keep a watchful eye on his lady—especially with hunks like Garrett Hedlund around.

    And we know Kris digs dudes who know their way around the guitar!

    But remember, K.Stew, you have very important business to take care of while in London—like winning over your boyfriend's parents while in his hometown, so don't let party pal Sienna (overly) lead you astray.

    PHOTOS: Global Party Pics!

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