The actor reportedly flew into a rage with Proenza Schouler designer Jack McCollough after he knocked into actress Brooke Shields at the Met Costume Institute Gala.
Sutherland is said to have confronted the catwalk mogul and told him to apologize to the star. He is then alleged to have headbutted McCollough in the face, injuring his nose, according to TMZ.com.
The Web site reports that a police report was taken and the incident is under investigation.
A spokesperson for Shields insists the actress has been left baffled by the incident, saying, "Nothing happened to her. Jack did nothing inappropriate. It's not clear what caused Keifer to do what he did."
Sutherland is currently under a probation order in Los Angeles relating to his 2007 conviction for driving under the influence.
He was sentenced to 48 days in jail but could be sent back to prison if he is found to have violated the terms of his release.
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