Kiefer Sutherland may have gone all Jack Bauer on a fashion designer in Manhattan.

Reports say the actor headbutted designer Jack McCollough — a co-founder of high-profile label Proenza Schouler — at a nightclub following the famed Costume Institute Gala at the Met.

Why? Apparently, he was defending the honor of Brooke Shields. The actors were reportedly talking outside Manhattan’s SubMercer when they were interrupted by McCollough. Some reports say McCollough bumped or shoved Shields, but Shields herself downplayed the incident, probably because she wants fashion darlings Proenza Schouler to keep sending her clothes.

Both Sutherland and Shields are expected to cooperate with police, who are looking into the matter.

Tags: brooke shields, kiefer sutherland