Don McLean's wife is singing bye bye Mr. "American Pie" ... she's filed to divorce him following the alleged domestic violence blowup at the their home in January.
Pat filed the docs in Maine on Thursday citing "adultery, cruel and abusive treatment, and irreconcilable differences."
This one isn't the least bit shocking ... considering a judge ordered Don to stay away from Pat following his arrest for the alleged 4 hour domestic assault. Pat said she thought she was going to die during the incident.
The couple was married for 30 years.