Movie bosses behind the upcoming Scream sequel are scrambling to find a last-minute replacement for Lake Bell after the actress dropped out just days before filming was due to begin.

The It's Complicated star was due to play a police officer in the upcoming fourth installment of Wes Craven's horror series, which sees Neve Campbell, David Arquette and Courteney Cox reprise their roles, alongside new talent including Emma Roberts and Hayden Panettiere. Bell has now been forced to quit her role due to scheduling conflicts and producers are desperately searching for a new actress to take over.

She announced the news in a post on her Twitter.com page, telling fans, "Sucks: Scheduling conflicts with my current gig means I can't do Scream 4!" and teased fans of the franchise by adding, "Hey horror bloggers, I know who the killer is..."

Scream 4 is due for release in April 2011.

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