Shia LaBeouf Headbutts Man in Bar Brawl

Jan. 17, 2013 — -- The recent problems of former "Transformers" star Shia LaBeouf have reached new heights.

The actor, who is already dealing with backlash from his alleged plagiarism of Daniel Clowes's graphic novel, was videotaped reportedly headbutting a man during a bar fight in London on Thursday night.

"What are you saying about my girl's mom? Are you f***ing kidding me?" LaBeouf reportedly said as he tilts his head down and throws it into some guy's face.

"What did you just say? What did you just say?" the actor, 27, yelled at the man, who apparently had said something negative to LaBeouf's girlfriend's mother.

Read: Shia LaBeouf's Biggest Public Missteps

The girls are yelling "Shia!" as they finally pull him off the man.

There are multiple videos of the altercation on TMZ, where the actor is seen fighting in a white baseball cap.

Earlier in the month, LaBeouf tweeted that he was quitting "public life" after it was discovered his short film, "HowardCantour.com" had entire passages taken from Clowes' story "Justin M. Damiano" and LaBeouf failed to credit the writer.

"I was shocked, to say the least, when I saw that he took the script and even many of the visuals from a very personal story I did six or seven years ago and passed it off as his own work," Clowes told BuzzFeed, which broke the story in December.

LaBeouf tweeted several apologies for getting "lost in the creative process" and neglecting to "follow proper accreditation."

He even hired a skywriter on New Year's Eve to display the message, "I AM SORRY DANIEL CLOWES" over the Los Angeles skyline.

A request for comment from LaBeouf's rep was not immediately returned.