Jack Bauer head butts Jack McCollough on his ass!

Keifer Sutherland "Jack Bauer" himself gets in a fitacuffs battle over Brooke Shields' honor or does he?

NYPD cops have decided to launch an investigation of their own into what is now the biggest "he said she said".
He tweeted-"Rashomon-esque celeb mash-up since The Hoff had too much to drink last weekend."

24's very own Jack Bauer (Keifer) is accused of perpetrating his signature move (the head butt) after flying into a rage and slamming his noggin into designer Jack McCollough after he allegedly knocked actress Brooke Shields to the ground at an after-party for the Met Costume Institute gala.

Multiple sources say that Sutherland, who had been imbibing, confronted the catwalk kingpin and told him to apologize to Brooke for a) touching her or b) knocking her down.

Sutherland's head then propelled itself forward, injuring the designer's nose.

"Nothing happened to her," Brooke Shields flack has stated. "It's not clear what caused Keifer to do what he did."

But according to The New York Post, cops are indeed investigating the incident.

Sutherland is still under a probation order in Los Angeles from his 2007 DUI conviction for driving under the influence (DUI). If he is found to have violated probation, he could find himself back in jail.

His rep has yet to respond to media queries, but all I can say is WAY TO GO!!
No one messes with Jack Bauer!