Well, it would appear you don’t want to piss Kiefer Sutherland off.  Just ask designer Jack McCollough.

According to TMZ.com, at the recent Met Costume Gala party, rumor has it that McCollough knocked Brooke Shields over.  Kiefer demanded that McCollough apologize and when the designer refused, Kiefer head butted him, possibly breaking the designer’s nose.

And the reason that McCollough didn’t apologize? Well, according to Brooke Shield’s peeps, “Jack did nothing inappropriate. It’s not clear what caused Kiefer to do what he did.”

Shield’s is expected to be interviewed by the police about the incident.

Kinda makes you wonder how the whole rehab thing is going for Kiefer.  Maybe he should add anger management to his program?