The Friday After Next star has signed on to appear in Dimension Films' latest horror spoof in an unspecified role, according to The Hollywood Reporter.
© WENN / Jody Cortes
© Dimension Films
Williams joins a diverse cast that includes Ashley Tisdale, Erica Ash, Lindsay Lohan, Charlie Sheen, Simon Rex, Molly Shannon, Terry Crews, Marisa Saks, Heather Locklear, Jasmine Guy, Angie Stone and Kate Walsh.
Angela "Big Ang" Raiola, Sherée Whitfield, Mike Tyson, Audrina Patridge and Kendra Wilkinson will also appear in the sequel.
There have been reports of controversy during the production of the film, with Lohan having been accused of stealing $15,000 (£9,349) in wardrobe from the set.
Scary Movie 5, directed by Malcom Lee with a script by Lee and David Zucker, arrives in theatres next year.
Watch a trailer for Scary Movie 4 below:
