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Abby Lee Miller's "Dance Moms" studio was swarmed with cops after they say a homeless man was arrested for trying to get inside.

Pennsylvania law enforcement tells TMZ Joe McKinstry showed up in the middle of a class Wednesday and started pulling at the studio's locked doors. We're told McKinstry demanded to get inside to read the students poetry.

However, by the time cops showed up ... they say McKinstry was sitting in the middle of the street refusing to leave. Officers had to tase him after they say he tried to attack them. He was arrested and sent to the hospital for a mental evaluation.

Cops say Abby Lee and the show's cast weren't at the studio when it all went down, but it's known McKinstry has an obsession with Mackenzie Ziegler.

We're told once he's released from the hospital, he'll be charged with aggravated assault, resisting arrest and disorderly conduct.

Dustin Diamond is back behind bars ... not even 2 months after he got sprung early for his concealed weapon conviction.

Cops in Saukville, Wisconsin busted the "Saved by the Bell" star for a probation violation on Wednesday, and he remains behind bars Thursday morning.

Law enforcement sources tell us Screech's violation screw up is drug related.

He scored an early release on April 11 due to his handiwork with a mop and bucket during his 3 months in jail for stabbing a man in a December 2014 bar fight.

Nyquist -- the winner of the Kentucky Derby -- is still battling a fever ... but his team believes he'll beat the illness and WILL compete at the Belmont Stakes next month.

We spoke with Nyquist's assistant trainer, Jack Sisterson, who tells us the champion thoroughbred still has an elevated temperature, as he did following the Preakness, but the team believes it's not that serious.

"Nyquist is going to be fine," Sisterson tells us ... "The plan is to run in the Belmont [on June 11th]."

"These fevers happen sometimes, but not often."

Celine Dion had no clue her 15-year-old son would be presenting her ICON Award at the Billboard Music Awards ... even though producers talked about it right in front of her.

That's because they used a code word for Rene-Charles during rehearsals. Our production sources tell us Celine's son was referred to as "the package" all weekend. This was the first time he had been to one of his mother's award shows ... which added to the surprise for Celine, we're told.

For keeping the secret, the teenager scored an awesome reward -- a backstage pic with Rihanna.

Oh, and Mom was really happy. That was good too.

Tupac Shakur's 1996 Hummer just left the auction block and it ended up fetching more than 3 times the amount of cash predicted.

As TMZ reported, Pac's hummer -- purchased less than a month before he was killed -- was being hawked through RR Auctions. It was estimated to fetch around $100k, but went for $337,000!

'Real Housewives of NY' star Carole Radziwill's boyfriend is recovering after he was lucky enough to walk away from a small plane crash.

Adam Kenworthy and his 65-year-old dad -- who was flying the plane -- made a crash landing Thursday in Iowa. Law enforcement tells TMZ ... Adam's father reported engine problems shortly before the plane went down on a hillside.

Carole tells TMZ Adam was released from the hospital a few hours after the crash, and his mom says he suffered a few abrasions but will be fine.

Adam posted a video to his Instagram Thursday from what we're guessing is the same plane that went down later in the day.

Jim Kelly, Bruce Smith and a gang of Buffalo Bills royalty traveled to Mexico ... all to surprise their former teammate, HOF running back Thurman Thomas ... on his 50th birthday.

TMZ Sports spoke to Thurman's wife, Patti Thomas, who says she surprised T.T. with a 5 day Mexican vacation. She invited 70 of his closest friends ... including Bills legends Jim Kelly, Bruce Smith, and Cornelius Bennett.

Oh yeah, Ken Griffey Jr. was there too.

Among the festivities ... a private golf tournament (Thurman's daughter won), some R & R at the pool, and ... French Champagne.

This isn't the first time the Bills have reunited in the 25 years since their first Super Bowl appearance. In February, Kelly and the guys hit up Napa Valley for a wine tasting tour.

#TheTeamThatLoses4HeartbreakingSuperBowlsTogetherStaysTogether

Sia and her famous bangs handed out major bucks ... $100k to one of the 'Survivor' finalists, who was 100% surprised by her generous gift.

During Wednesday night's finale a voice was heard interrupting Jeff Probst ... and then Sia shocked everyone by jumping onstage and dishing out the dough to fan favorite Tai Trang. Sia's reason for the big donation -- she's a huge fan of the show and was moved by Trang's positive messages throughout the season.

$50k is going directly to Trang, and the rest to his favorite charities. Trang tells us he's still unsure how he'll spend his cut -- but is vowing to spread the other half around several charities in San Francisco, where he lives.

Zoe Kravitz packed 'em in for her performance at a YSL launch party on the Sunset Strip -- and while the famous guests loved the action ... the neighbors did not.

Kelly Osbourne, Hailee Steinfeld, EJ Johnson and model Genevieve Morton (yeah, the hot one in white) were just a few of the celebs there when about 4 cop cars pulled up to the old Tower Records building at 10:30 PM.

We're told at least one normie living in the area wasn't happy about the noise from the event. Too bad for that person -- YSL had a permit to party until 11 PM ... and they did.

Earplugs, bro. Earplugs.

4:30 PM PT -- Kesha now denies she was going to take a shot at Dr. Luke at the BMAs ... insisting she was merely going to perform a tribute to Bob Dylan by singing a cover of his, "It Ain't Me, Babe."

She says she was never going to "allude to my legal situation in any way. I simply wanted to sing a song I love to honor an artist I have always looked up to."

Production sources on the award show tell us the Dylan classic includes several lines that could easily refer to Kesha's situation with Luke ... and that was not a coincidence.

Dr. Luke is putting the kibosh on Kesha performing at the Billboard Music Awards ... where she was planning to make a "statement" about her war with Luke and Sony.

A rep for Dick Clark Productions -- which is producing the award show on Sunday -- says Dr. Luke's label, Kemosabe Records, has been unable to reach an agreement with Kesha for her to take the stage.

TMZ broke the story ... production sources told us the singer was going to reference her epic legal battle during her live BMAs performance. Problem for her is Kemosabe holds all the power, since it still controls her music rights.

We're told Dr. Luke had signed off, but pulled the plug once he got wind of what Kesha was planning.

The Game is makin' it PURPLE rain in his living room ... thanks to a massive custom painting he commissioned in Prince's honor ... TMZ has learned.

Sources tell us Game hired artist Madsteez the day Prince died and asked him to create a tribute piece. The rapper -- who came thiiiis close to recording with Prince -- picked out a shot from "Purple Rain" as inspiration.

We're told Game dropped $65k on the artwork, which took Madsteez more than 100 hours to complete. The 8' x 6' portrait is a combination of oil, acrylic and spray paints -- and, as of Sunday, has been hanging proudly in Game's crib.

"Days of Our Lives" actor Eric Winter is recovering in a hospital with debilitating and mysterious numbness.

Eric has been dogged by neck and back issues for years, and he's already gone under the knife twice, but without success.

The pain was too much and last Tuesday he went back in ... it was especially alarming because he experienced numbness running down his right arm.

Lucky for Eric ... doctors did not perform a third neck surgery. They tried a minor procedure they hope will do the trick.

It's been a rough couple of weeks for soap stars. A "General Hospital" actor was in a horrendous car accident but got off pretty easy.

Prepare for a cuteness OVERLOAD!!!

Here's Leah Still announcing to all of NYC ... that her father, Devon Still, is getting married today!!!

#MostAdorableThingEver!!!

The Houston Texans defensive end is tying the knot to his longtime girlfriend Asha ... and it's all going down at the NYC Public Library -- a historic landmark and one of the most beautiful buildings in the city.

We're told the guest list is around 200 and will include several of Devon's NFL friends -- including Pro Bowler Carlos Dunlap. In fact, Bengals defensive lineman Brandon Thompson is one of his groomsmen.

Of course, Leah is the flower girl!!

BTW, we're told the couple waited 2 years to get married ... until Leah was healthy enough to walk down the aisle. Amazing, right?!

Congrats!!!!

The Greg Hardy image makeover tour rolled through a 5th grade class in Mississippi Thursday -- where the embattled NFL star read to kids, signed autographs and of course, posed for pics.

TMZ Sports has learned ... Hardy hit up the Oxford Intermediate School in Oxford, Mississippi yesterday. Sources tell us he was invited by a teacher who met Hardy at church.

We reached out to Principal Steve Hurdle who tells us, "[Hardy] spoke to a class about being good students and working hard. He read a book to the class and then he left our campus."

It's unclear if parents were informed about Hardy's appearance before he arrived on campus.

Hardy is a curious choice as a guest speaker to 5th graders considering his past -- which includes a 2014 domestic violence conviction that was overturned on appeal when the accuser stopped cooperating with prosecutors.

Hardy's agent has said the NFL star is getting help for his behavioral issues -- including individual and group counseling.

For his part, Hardy said he "had a blast" at the school ... and said the kids were "awesome."

The Joan Rivers malpractice lawsuit has settled for millions of dollars ... TMZ has learned.

Melissa Rivers sued the clinic where Joan Rivers slipped into unconsciousness and never recovered. Melissa sued Yorkville Endoscopy as well as Dr. Gwen Korovin, the doctor who allegedly was not authorized to be in the surgery room and was working on Joan when the emergency occurred.

The settlement came very quickly by legal standards ... it never even reached the deposition stage.

As for the money, our sources would not be specific, but one source insinuated it is in the 8 figures.

You may recall one of the doctors took a cell phone pic of Joan when she was under, which became quite embarrassing for the clinic.

Melissa Rivers says she's happy "those culpable for [Joan's] death have accepted responsibility for their actions quickly and without equivocation." She hopes the lawsuit and settlement will force an elevation of standards in outpatient surgery clinics.

If Justin Bieber's got beef with his fans, he didn't show it as he partied hard in a couple of Boston bars like any other 22-year-old ... who can afford round after round of shots.

After his Purpose concert Wednesday, Justin hit up Storyville nightclub and looked totally comfortable being the life of the party. He was up on the bar doing tequila shots, and didn't mind people taking photos. A rep from 6one7 Productions tells us he racked up about $2,400 worth of tequila and vodka.

Cool moment in the video -- the DJ bumping Justin ... Timberlake, that is.

Biebs started his night at The Tam ... a joint most locals call "a dive bar." We're told he drank Sam Adams, ordered shots of Fireball for a table of guys and girls and was "super nice" to everyone.

Even though his bodyguards made everyone put down their smartphones -- no "zoo animal" pics -- watch this video ... you can tell folks in The Tam treated JB like any other booze hound.