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Ex-NFL player Jonathan Martin -- who was at the center of the Miami Dolphins bullying scandal -- has been detained by police ... after he allegedly posted a disturbing photo of a gun, ammo and the names of ex-NFL teammates.

The post first appeared on Martin's Instagram account -- showing an image of a shotgun surrounded by ammunition with the caption, "When you're a bully victim & a coward your options are suicide, or revenge."

He also listed social media handles for ex-Dolphins teammates Richie Incognito and Mike Pouncey.

Martin also posted the name of his former high school -- Harvard Westlake -- one of the most exclusive private schools in the country.

Harvard Westlake closed the school in the wake of the threats -- telling students to stay off-campus in an abundance of caution.

Law enforcement tells TMZ Sports ... "The individual we believe to be responsible for the social media post has been detained and the investigation is ongoing."

Martin famously accused Incognito and Pouncey of physically and emotionally abusing him during his stint on the Miami Dolphins in 2013.

The players claimed they were just harmlessly hazing Martin.

J Lo went all out for her twins' 10th birthday party ... and she took REALLY good care of the people who helped throw it.

Jennifer put on a bash for more than 30 guests at the Sugar Factory in Las Vegas Thursday night to celebrate Max and Emme's bday. We're told the party arrived around 5 PM and threw down for FOUR hours ... and made good use of their time.

Well-connected sources tell us the bill was $7,500 and included custom cakes for each child -- red velvet Mario Bros. cake for Max and chocolate sloth cake for Emme. They also gorged on virgin gummy worm goblets, and a King Kong Sundae ... with 24 scoops of ice cream topped with sparklers!

There's a new Bieber coming into the world -- and it's a she ... TMZ has learned.

Sources close to Justin Bieber's dad, Jeremy, tell us his new bride, Chelsey Rebelo, is pregnant with a baby girl -- which means Justin has a new sister on the way.

We're told Chelsey is about 16-20 weeks along (4-5 months) and that her and Jeremy's pink-themed wedding in Jamaica this week was in honor of their forthcoming daughter. It's her first kid with Jeremy -- who already has 3 of his own ... Justin, Jaxon and Jazmyn.

As we reported ... Justin didn't make a toast at his dad's wedding, but was pretty preoccupied with Selena Gomez during the trip. They were seen all day hugging and kissing. He also seemed to be in very good spirits, and now we fully know why.

Congrats to the Biebers!

Jemele Hill says her opinion of Donald Trump has NOT changed -- she still believes he's a white supremacist ... but she probably wouldn't ever tweet that again.

The ESPN star appeared on "The View" on Wednesday and was asked about the tweet that led to her suspension back in October.

"I still stand by what I said," Hill told Meghan McCain ... adding, "I don't think his supporters are white supremacists."

However, Hill says Trump is surrounded by people with similar beliefs -- including Steve Bannon and others who have "played footsie" with white supremacists.

Hill also said if she had to do it over again, she wouldn't have tweeted -- instead she would have gone to ESPN and asked to write a column so she could have explained her position in greater detail.

We spoke with Hill after the show and she told us ESPN has given her the green light to talk about "issues that intersect with race sports culture and politics" in her new role with ESPN's website, the Undefeated.

And since she's a pop culture fanatic, we also asked Hill about comic books and the new "House Party" remake!

Just when you thought the sale of the "Dumb and Dumber" mini bike couldn't possibly be any dumber, it was.

The hog featured in the classic 1994 comedy, and used to get Lloyd and Harry to Aspen ... hauled in $50,000 for the Houston man who sold it on eBay to fortify his kid's college fund. Considering the opening bid was $8,500 ... nice work, Dad.

The new owner is Todd Lyons from New York, who tells us one of his friends told him he wanted to bid on it, but his wife lowered the boom. Todd had no one dissuading him, so he went for it. Three cheers for bachelorhood!

As we reported ... the mini bike was one of 2 used in the film, specifically in all the close-up riding scenes with Jim Carrey and Jeff Daniels.

Justin Bieber's dad, Jeremy Bieber, got hitched Monday evening -- and while the Biebs and Selena Gomez were there ... Justin passed on making a toast.

Sources tell us Jeremy tied the knot in Montego Bay with his longtime girlfriend, Chelsey Rebelo -- and Justin and Selena were among the 30 or so guests. We're told JB flew down, stopping in Texas on the way to pick up Selena ... before touching down in time for the wedding.

Justin and his younger siblings, Jazmyn and Jaxon, were all part of Jeremy and Chelsey's wedding party. For once, Justin did NOT want to get on a mic ... we're told he did not make any sort of speech during the reception.

The wedding itself went down in the backyard of a villa, and we're told a local DJ and band handled the tunes. Jeremy's friend, Andy Curnew, helped organize things and even booked the pad.

Congrats to the couple!

Milo Yiannopoulos' $10 million lawsuit against Simon & Schuster is over and done ... and the publishing giant says it isn't paying him a dime.

TMZ broke the story ... Milo sued his former publisher claiming they caved from mounting pressure -- from all kinds of celebs -- to put the kibosh on his book deal after allegations surfaced he condoned pedophilia.

Milo's lawsuit claimed Simon & Schuster was set to publish his book, "Dangerous," but got cold feet when stars like Sarah Silverman and Leslie Jones put Milo's publishers on blast for helping Milo spread hate speech.

Now both sides have filed to dismiss the lawsuit, and Milo can't refile it either. Usually that means there was some sort of settlement paid, but Simon & Schuster says "We are pleased that Mr. Yiannopoulos’ lawsuit has been withdrawn, with prejudice, and with no payment. We stand by our decision to terminate the publication of Mr. Yiannopoulos’ book."

The only upshot for Milo is his $80,000 advance for the book. He tells us he got to keep that, and brags he's made more than $1 million from publishing the book on his own. He says he didn't want to blow that money on lawyers ... and that's why he walked away from the lawsuit.

It seemed like a joke, but Barstool Sports president Dave Portnoy tells TMZ Sports the organization REALLY did fire Michael Rapaport this weekend after he insulted the company's fans.

It all started when Rap posted a tweet saying "Stoolies" are losers in life. Portnoy says he and the rest of the staff took offense ... "That was the ultimate deal-breaker."

Portnoy says Rapaport was under contract with Barstool -- as part of the deal, he would create original content like viral videos and Barstool would "rep" Michael's popular podcast, "I Am Rapaport."

It seemed the two sides had a great business relationship -- but Portnoy says it turned into an "utter and complete train wreck."

Portnoy tried to fire Rapaport over text message -- but accidentally sent it to NFL insider Ian Rapaport instead. Eventually, Michael got the message.

"To me, it was very personal. It was very real," Portnoy says.

Scottie Pippen ain't playin' in the All-Star Game this weekend, but he already scored ... a freakin' awesome $30,000 luxury Swiss watch -- at a celeb packed party last night.

Haute Living and Larsa Pippen threw Scottie a party at Bungalow 1 at Chateau Marmont in L.A. to celebrate his Hall of Fame career.

Scottie -- along with guests like Kourtney Kardashian, Ludacris, Omarion and L.A. Reid -- ate (steak and salmon) and drank super expensive Louis XIII cognac.

Best part of the night (at least for Pip) ... when HL presented him with a Roger Dubuis Titanium Excalibur 45 timepiece -- a watch they tell us goes for $30k.

Now Scottie's got a watch to go with those 6 rings.

Marilyn Manson gave fans in New York a performance they'll never forget ... for all the wrong reasons.

The shock rocker had a show at The Paramount concert hall in Long Island Thursday night, which we're told got started 90 minutes late. No biggie, it happens. But once Marilyn started, a concertgoer tells us Marilyn struggled through a mere 5 songs, acted strange, then went into a meltdown before leaving the stage for good.

The concertgoer also says Manson was wearing a white cast on his leg -- he was injured at a show in September -- and trashed New Jersey by calling it a "s**thole" before his early exit.

We're told he left during a long guitar solo and never returned, and security told everyone to leave with no explanation. Some fans thought he was "wasted" because he pushed over an amp and urged the crowd to tell him they loved him.

Our source says she paid $260 for 2 tickets and wants her money back.

Stan Lee's house was swarmed by cops Thursday after a man allegedly refused to leave his property.

Law enforcement sources tell us they were called to the Marvel founder's L.A. home after a former bodyguard of Lee's showed up. We're told both Lee and his daughter asked Max Anderson -- a convicted felon -- to leave, and when he refused, they called police to intervene.

Our sources say reps from adult protective services were also called. Once officers arrived they spoke to Anderson, and we're told he agreed to leave peacefully.

Stan has had a rough past few weeks ... he was taken to the hospital earlier this month for heart trouble and cops are investigating the unauthorized purchase of an $850k condo made in Stan's name.

On the bright side ... "Black Panther," which he co-created, is already killing it at the box office.

In response to Thursday's incident, we're told Stan has hired private security to watch his property 24/7 to prevent any more intruders.

If you've ever wanted to raid Kim Kardashian's closet, here's your chance to do it ... without getting arrested for trespassing.

A bunch of Kim K's old wardrobe and accessories are being auctioned off on eBay right now through marketing agency Auction Cause -- with more than 200 items up for grabs.

Here's the cool part ... a lot of this stuff is "Pre-owned," meaning they were worn or used by Kim herself at some point. There's also a handful of new items she owned but never wore -- such as bikini bottoms. Nothing used in that department. Sorry, creeps.

'Survivor' winner Jenna Morasca allegedly was so whacked out on drugs she had to be revived with Narcan and, when she regained consciousness, she bit a cop.

Morasca, who won a million bucks on "Survivor: The Amazon" in 2003, was observed unconscious in her SUV in Washington, Pennsylvania in an intersection with the ignition on ... this according to the police report obtained by TMZ.

Cops were called, and they observed a passenger in the car trying to hide several syringes in a large Ziploc bag in her purse. Cops quickly determined Morasca was under the influence, administered Narcan, and placed her on a stretcher and into an ambulance.

According to the police report, Morasca, who also appeared on "Survivor: All-Stars" and "The Amazing Race," tried to bite paramedics on the way to the hospital. An officer entered the ambulance trying to subdue her, and cops say Morasca bit her on the forearm.

Johnny Manziel has signed on to play full contact football again -- as a quarterback in the upcoming "Spring League."

The league kicks off on March 28 in Austin, TX -- and during the 2017 season, several NFL scouts attended games to check out some of the players.

Previous Spring League players include Greg Hardy and Kellen Winslow Jr.

Manziel issued a statement saying, "The Spring League has provided me with a great opportunity to play ball again, and ultimately, that is all I want to do."

"I miss the competition. I'd like to thank Brian Woods and The Spring League staff for this opportunity to play the game I love. I've made my share of mistakes, but I'm 25 years old and I know my best football is ahead of me."

The Spring League had previously made 2 conditions for Manziel to play -- nightly check-ins with a team staff member at 9:30 PM AND he must pass a USADA drug test on the first day of the league.

No word if those conditions still apply.

Rob Gronkowski and his family are raging through New England -- hitting up 3 children's hospitals in less than 24 hours ... in a mission to give away a TON of cash!!

Rob -- along with his bro Dan and father Gordie -- decided today would be the day they distributed the $75,000 they raised by raffling off tickets to the Super Bowl.

The donation spree started off at Boston Children's Hospital -- where the Gronks played games with the kids and then presented a big, ol $25,000 check!!!

Dan tells TMZ Sports the family is en route to Barbara Bush Children's Hospital in Portland, Maine -- followed by Hasbro Children's Hospital in Rhode Island.

And yes, each hospital gets a big $25k check -- and some play time with the Gronks!

Former boxing champ Adrien Broner was arrested in Atlanta Monday night for allegedly sexually assaulting a woman at a local shopping mall, TMZ Sports has confirmed.

Officials tell us ... cops were called to the Lenox Square shopping center Monday evening where a woman told police Broner had " inappropriately groped her."

Broner denied the allegation -- but after being interviewed by cops, they believed there was enough evidence to arrest him for misdemeanor sexual battery.

The 28-year-old was transported to Fulton County Jail without incident.

He's scheduled to face a judge around 9 AM local time. His booking sheet lists him at 5'8" and 160 lbs.

BSO is reporting the incident took place in front of a Louis Vuitton store.

Broner has had numerous outside-the-ring issues over the years -- including a September incident where he socked a man in the face on the Vegas strip.

His "big bro," Floyd Mayweather, tried to step in and mentor him back in 2017 ... but it doesn't seem to be working.