Lindsay Lohan is shown in court in Beverly Hills in this July 20, 2010 file photo. (AP Photo/Al Seib, file)
Writer-director Matthew Wilder says his production team is in negotiations with another actress and will make an announcement soon.
Some media reports say the 24-year-old starlet quit to focus on her court-ordered rehab for drug addiction; others say Wilder wanted her replaced.
The "Mean Girls" star is expected to be in rehab in southern California until at least January 3.
The actress has become more of a tabloid mainstay than box office draw since a pair of high-profile arrests in 2007 led to a drug and drunken driving case.
A judge last month ordered Lohan to rehab. It was her fifth time in court since May. The ruling allowed her to avoid a fourth trip to jail.
