TMZ has confirmed that Kiefer Sutherland will be charged with misdemeanor assault in connection with a headbutting incident earlier this week.

Kiefer headbutted fashion designer Jack McCollough at an event after-party on Monday -- an attack Jack says was completely unprovoked. Kiefer says he did it after Jack pushed Brooke Shields.

The New York Daily News broke the story. Kiefer will show up at the NYPD and get a desk appearance ticket and his arraignment date will be set.

A rep from the L.A. City Attorney's office told TMZ they will contact the NYPD and the D.A. to get details and then decide if they will try and revoke Kiefer's probation. He's currently on probation for a DUI.