The cameo list keeps growing for "Scream 4" -- and now "90210" star Shenae Grimes and "Pretty Little Liars" star Lucy Hale are part of the killer ensemble.
Last night, Shenae Twittered the above photo from the set (left), saying, "Waiting to bang out my cameo in scream 4! All hush hush but stay tuned! X."
An hour later, she tweeted at Lucy (inset), "what's your favorite scary movie?? LOL glad to be here with ya! X"
As we previously reported, "True Blood's" Anna Paquin and "Veronica Mars" star Kristen Bell are also filming cameos for the flick.
Our guess: They're playing actresses in the "Stab" films, like Tori Spelling and Heather Graham in "Scream 2."
