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The actress, who plays Naomi Clark in the CW show, has been tipped to appear as Heidi, a "fisher" who uses her beauty to lure humans to the Volturi vampires.
A source told E! News: "It's not a big part. Heidi would be more like a cameo."
McCord's 90210 co-star Kellan Lutz played Emmett in Twilight and has been confirmed to return for the sequel.
Production is scheduled to begin in Washington next month, with a slated November release date.
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