In the wake of this news about two confirmed cameos in Scream 4 comes the addition of two more actresses.
Shenae Grimes confirmed to her Twitter followers that she'll be making a cameo in the sequel. Grimes is best known for her turn as Annie Wilson on 90210. Also, Scream-Trilogy's spies have spotted Lucy Hale of Pretty Little Liars on set as well.
The casting additions are no surprise. It was recently revealed that Scream 4 is going to continue shooting well into late September. There's more work to be done.
Source: Shock Till You Drop