Avril Lavigne Files for Divorce
10/14/2009 AT 07:00 PM EDT
Lavigne, 24, cited the standard reason of irreconcilable differences and said that their property rights are to be determined, according to the Superior Court papers filed Friday.
Lavigne and the 29-year-old musician for Sum 41 were married for three years. They announced their separation last month.
Earlier this month, Whibley was spotted getting close with model/designer Hanna Beth Merjos in Las Vegas.
Lavigne's attorney wasn't immediately available for comment.