Cranberries Singer Dolores O'Riordan Arrested ... Headbutted a Cop!

Cranberries singer Delores O'Riordan was arrested following a flight from New York to Ireland after she allegedly assaulted an airline staffer ... and then she headbutted the cop who tried to arrest her!

The 43-year-old singer was removed from the plane after it landed at Shannon Airport. She was taken to a local hospital but is still in police custody.

Police say the female crew member that O'Riordan allegedly attacked was taken to the hospital with a leg or foot injury. The officer O'Riordan allegedly headbutted was not seriously hurt.

The Cranberries became popular in the mid-1990s and are perhaps best known for their song "Zombie."

Why does this feel alcohol-related?