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The writer Thomas Gibson kicked on the "Criminal Minds" set is anything but a nerd ... he's a boxer/martial artist with a super aggressive attitude -- sources connected to Gibson tell TMZ.

Virgil Williams is the writer/co-executive producer who got into it with Gibson when the argument escalated to the point the actor kicked him. But our Gibson sources say Williams escalated the verbal argument by "making a move" toward Gibson in a highly aggressive manner. They say Gibson's kick was more a reaction to the perceived threat than an aggressive move.

Our sources say Williams lets everyone on the set know ... he's trained as a boxer and does martial arts.

Justin Bieber has a teenybopper on his tail ... she follows him everywhere these days. She's 17.

Sofia Richie -- daughter of Lionel -- joined the 22-year-old on his private jet Thursday ... likely bound for Japan where he's appearing this weekend.

They've been inseparable for the last few days.

Lionel's little girl turns 18 in 13 days.

Thomas Gibson's angry outburst at a "Criminal Minds" writer wasn't the first time he's been violent on set -- connecting with a director's chin -- TMZ has learned.

Our production sources tell us in 2010 Gibson pushed an assistant director in front of cast and crew while filming a scene. At the time, he blamed it on the AD moving too slowly. He wasn't suspended, but it was enough for network honchos to send him to anger management classes.

And that's just one in a string of incidents. We've learned Gibson's been aggressive and verbally abusive for years on set, but no one's said anything about it since he's the show's star.

We broke the story ... the writer Gibson kicked had enough and put in a call to his agent, who then called the network to do something about it.

A video of late Toronto mayor Rob Ford smoking crack has just been released to the public -- 5 months after he passed away from cancer.

In the video, shot in Feb. 2013, Ford hits a crack pipe while a friend trashes current Canadian Prime Minister, Justin Trudeau, who was elected in 2015.

The friend says, "I'd like to get that f***ing Justin Trudeau and shove my foot as far up his ass because I'm sure it would go real far."

Ford laughs and says, "He's a fat dick."

Ford also says he's mad about the misconception that he's a right wing radical.

Important to note Ford doesn't realize he's being recorded until the very end of the video.

The video was used as an exhibit in the extortion trial of Rob's friend, Sandro Lisi ... who was charged with trying to extort a gang member to get the clip.

The court had ordered the video to stay private while the case was underway -- but on Thursday, the extortion charge against Lisi was dropped and the video was made public.

Ford admitted to smoking crack during his time as mayor -- though he denied he was an addict.

JoJo Fletcher's running the show ... now that Jordan Rodgers officially moved to Dallas.

Jordan loaded his crap into a moving truck that made the trek from his Nashville pad to a new house the 'Bachelorette' couple just bought in Big D.

Thomas Gibson has been suspended from the hit television series "Criminal Minds" after going ham on a writer, kicking him in the leg.

Production sources tell TMZ ... the actor was directing and acting in a scene a few weeks back when he got in a creative dispute with one of the writers. We're told the argument escalated and Thomas exploded in anger, kicking the writer in the leg.

We're told the writer was not about to let it go ... he called his agent, who then called network honchos. At that point the network had to take action and suspended Thomas ... it's unclear for how long, but he's been gone for 2 weeks.

Thomas claims he kicked the writer "in retaliation" after the writer became "aggressive."

Gibson tells TMZ, "There were creative differences on the set and a disagreement. I regret that it occurred. We all want to work together as a team to make the best show possible. We always have and always will."

Sometimes "Criminal Minds" don't think alike.

The crew has chosen sides in the "Fast 8" feud between The Rock and Vin Diesel ... and Rock wins, hands down.

Production sources tell TMZ, The Rock has been upset with Vin's work ethic for a long time, and he's not alone. Members of the crew tell us Vin was often 30 minutes to an hour late to shoot scenes ... and it wasn't because he was late to the set -- he was simply in his trailer and wouldn't come out.

We're told Vin didn't like Monday 7 AM calls so production was forced to make the start time 10 AM to accommodate him.

And the crew felt Vin's arrogance was out of control, especially because he had a producer title. We're told he wouldn't listen to anyone and would goad people, including The Rock, by criticizing their acting.

The crew has a vastly different view of The Rock. They say he's the ultimate professional who is always on time and always nails his scenes. They also say he's easy to work with.

As we reported, Vin and Rock have been clashing for a long time and it came to a head Monday when Rock exploded on social media, calling out a male co-star (it's Vin) for being unprofessional.

And as we told you, Vin confronted Rock Tuesday in Rock's trailer, but their issues remain unresolved.

Kylie and Kendall Jenner paraded around Turks and Caicos in skimpy bikinis ... not that we're complaining.

Kylie celebrated her 19th birthday on the island and brought along her sister and some friends. Check out the pics ... oughta get you ready for thirsty Thursday.

Oh look ... there's Tyga!

Vin Diesel has secrets he's now going to share ... about what appears to be an excruciating experience riddled with conflict ... but so far, nothing.

Vin posted this video, in which he obliquely refers to his war with "Fast 8" co-star The Rock.

Vin captioned the video, "So much has gone in this year. I can't believe I wrapped two back to back pictures I both starred in and produced. Now I get to return to my family, my life ... To me."

Interesting he says "starred and produced." The producing part, we're told, is part of the conflict he had with The Rock.

Michael Sam says he's moving on from his near street fight in West Hollywood -- telling TMZ Sports he's way more upset at the way "Game of Thrones" ended last season.

Young Buck is heading back to prison.

Buck was in court Wednesday for a probation violation, and the judge didn't go easy on him ... he was sentenced to 7 months behind bars.

TMZ broke the story ... Buck was arrested last month for allegedly threatening to torch his ex-GF's apartment.

The probation all stems from a 2012 gun charge when federal agents found illegal firearms in his home during a raid.

Stevie J says Joseline Hernandez's life is all a lie -- right down to her age -- but the fibs weren't enough to convince a judge to issue a restraining order against her.

Stevie came out firing with juicy details about his "Love & Hip Hop: Atlanta" ex ... hoping they'd persuade a judge to extend a restraining order he got last month.

In his docs Stevie points out Joseline's real name is Shenellica Juneann Bettencourt ... she's 39 years old (not 29) ... isn't even from Puerto Rico ... might STILL be married to someone else ... and the baby in her belly probably isn't his.

The "newly discovered facts" fell flat ... because none of it had anything to do with the price of beans, or in this case granting a restraining order.

Beyonce, Jay Z and Blue Ivy are cruisin' like they're some kind of music royalty.

The Carters docked in Capri Tuesday, after several days of tooling around the Mediterranean.

Mel Gibson's baby mama, Oksana Grigorieva, just got word from a California appeals court ... she made one of the worst business decisions in the history of business ... because they just ruled she's only entitled to 1/60 of what she could have gotten from him had she just shut her trap.

The California Court of Appeals just dropped the hammer, saying Oksana screwed herself when she went on Howard Stern in 2013 and claimed domestic abuse at the hands of Gibson. The actor was on the hook for $750,000 -- a settlement he had struck with her -- but had only shelled out $250,000.

The agreement said she would forfeit the balance if she blabbed about her allegations, and the court said that's exactly what she did when she went on Stern. So, Mel does not have to pay the $500k balance.

Mind you ... Mel had agreed to pay Oksana $15 million if she kept those horrible audiotapes secret, but she changed her mind thinking she could get even more and disavowed the deal. Instead of $15 mil, she eventually struck a deal for $750k ... and that has now been whittled down to $250k.

Maybe she's just bad at math.

Liam Hemsworth needs a better handle of things if he's gonna booze hard.

Liam dropped an entire case of beer Wednesday as he left a Malibu store.

Hey ... at least he's got good beer taste.