Former BAYWATCH star DONNA D'ERRICO is set to join Hollywood's ex-wives club after filing for divorce from Motley Crue bassist Nikki Sixx. D'Errico is citing irreconcilable differences as she seeks to end the nine-year marriage and she is seeking physical custody of the couple's five-year-old daughter. The actress also has a teenage son from a previous relationship and Sixx has three children by ex-wife BRANDI BRANDT. In court papers filed yesterday (01MAY06), D'Errico requests the court gives joint legal custody with child visitation to Sixx. The couple split briefly in 2001 as Sixx sought help for drug abuse problems. They split for good last year (05). Sixx and D'Errico wed in December 1996.