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Taylor Swift's security team sprung into action when a man showed up on her NYC doorstep Tuesday evening ... TMZ has learned.

Taylor's guards detained the unidentified man, and someone called 911. NYPD and NYFD responded to Swift's Tribeca home around 6 PM and described the man as "disoriented" as he was handcuffed.

From the video, it appears he had a duffel bag ... which police searched. Law enforcement sources described him as "emotionally disturbed," and he was taken to a hospital for evaluation.

Taylor was not home. It's unclear if he made any threats or actually gained access to her crib.

So far, he hasn't been booked for any crime.

An unlucky Eagles of Death Metal fan got Mike Tyson'd, right in the middle of a concert.

A brawl erupted during Saturday's show at Toronto's Opera House, after a man bumped into the ear biter. The victim lost a chunk of his left ear, running from just above the lobe to the curvature.

The Toronto PD tells us the biter was arrested and charged with aggravated assault.

A witness says a concertgoer picked up a piece of ear, put it on ice in the hope doctors could reattach it. We don't know if the surgery was successful.

Bristol Palin and baby daddy Dakota Meyer are finally getting along as parents ... and in the ultimate show of goodwill, she is signing off on the baby getting dad's last name.

According to court docs ... Meyer filed a petition to rename the couple's 5-month-old daughter from Sailor Grace Palin to Sailor Grace Palin Meyer. He also said he's now listed on the baby's birth certificate.

Bristol included her own doc ... signing off on the name change.

As for their custody woes ... we're told both Bristol and Dakota are committed to co-parenting and getting along. They even spent Mother's Day together in Alaska.

Andre Berto's mom had one helluva Mother's Day -- when her boxer superstar son surprised her with a FLORIDA MANSION ... and you gotta see her reaction!

TMZ Sports has the video ... when Andre (who reportedly made around $7 mil for his last 2 fights) brought his parents to the 5,000 square foot crib he secretly purchased in Winter Haven, Florida.

Berto wouldn't give us an exact number -- but says he dropped more than $1 mil on the pad -- which boasts 6 bedrooms, a sick pool and a great location inside an exclusive gated community.

"I wanted to make my mother happy," Berto told us.

Mission accomplished.

Stitches is apologizing -- sort of -- for punching one of his fans, and even going all out to make things right with the guy.

The swift response came after Stitches said he realized the fan, at Voltage Lounge in Philly, meant no harm -- he reached up and slapped Stitches in the stomach. The rapper got pissed and struck back with a left hook.

Cashius Clay (for real), Stitches' manager, tells TMZ the rapper knows he was in the wrong, but adds Stitches reacted how anyone else would have -- especially after someone pulled a gun during a recent gig in Canada.

Stitches already reached out to the fan on FaceTime, and hooked him up with tix to an upcoming show in Miami. We suggest he keep his hands to himself this time.

Turns out Paisley Park isn't the only Prince real estate that could be hitting the market.

Back in 2010, Prince purchased a 10,000 square foot fortress on the island of Providenciales in Turks and Caicos. Asking price ... $12 million!

The 10 bedroom and 10 bathroom mansion comes with a tennis court, 200 foot boat dock and its own private white sand beach.

Robert Greenwood of Christie's International Real Estate tells us Prince had not fully moved in -- it's sparsely furnished. There's actually a few items in the house from the "Purple Rain" movie, including a mirror and a few chairs.

Justin Bieber had to regulate on Desiigner in the packed 1 OAK nightclub when the rapper's performance spilled into the VIP section ... TMZ has learned.

Sources in the NYC hot spot tell us 19-year-old Desiigner -- recently signed to Kanye West's label -- was putting on a hell of a show Thursday night, and Justin was watching from the VIP area.

We're told it was all good until Desiigner got "a little too hyped" ... started jumping around and "stomped" multiple times on Justin's feet. That's when JB flexed on him.

We're told Desiigner immediately turned around and said "My bad."

Tiger Woods could be a player in this year's Kentucky Derby if a horse named Suddenbreakingnews manages to win, place or show.

Experts say the 3-year-old thoroughbred has an outside shot at taking it all on Saturday -- and if he does, get ready to hear the name Rachel Uchitel, repeatedly. Turns out a mare named Uchitel birthed Suddenbreakingnews.

Sbn is currently at 20-1 odds -- kinda middle of the pack -- to win, and has already overcome 2 big hurdles ... his balls. Or lack thereof.

Kitty Taylor -- who brokered the $72,000 sale of Suddenbreakingnews -- says the horse is a gelding ... meaning his testicles were removed, since they never dropped. We're told it's really rare for a gelding to make it as far as the Derby.

Taylor adds, "Perhaps Tiger should have been gelded at some point."

The Federal Drug Enforcement Administration is now involved in the death investigation of Prince, and our law enforcement sources say drugs are the focal point of the criminal probe.

Our sources say the DEA and the Minnesota Attorney General are looking into the various prescriptions that were written for Prince, and the focus is opiates. Prince had a life-threatening Percocet addiction and authorities believe opiates will likely be either the sole or at least a significant factor in his death.

Our sources say the investigation is sweeping ... doctors and pharmacies involved in prescribing and filling meds for Prince are targeted, but possible enablers are also in the crosshairs.

Our sources now say the toxicology report may still be weeks away, although it was initially set to be released 2 weeks after the autopsy.

50 Cent has new legal trouble after taunting a 19-year-old man who turned out to be autistic -- TMZ has learned his family is strongly considering a lawsuit.

Andrew Farrell was just doing his job as a janitor at the Cincinnati/Northern Kentucky airport when 50 Cent appeared to randomly single him out on video ... accusing him of being high at work. Fiddy posted the video on Twitter.

Ken Kramer, Andrew's stepdad, tells us Andrew suffers from autism and Asperger's syndrome. He also has a hearing condition which forces him to wear a hearing aid.

Ken says Andrew has never smoked or had a sip of alcohol in his life. He says Andrew has severe social anxiety, and that's why he ignored 50 -- he also doesn't know who the rapper is.

Ken says the family has lawyered up, and the only thing stopping them from suing immediately is concern about stiff attorney fees. He says they'd be willing to forget the whole thing, IF 50 Cent donates $1 million to Andrew's GoFundMe page, and makes a face-to-face apology.

They might want to research 50's finances.

The U.S. citizen who was held captive in North Korea for 735 days is THANKING Dennis Rodman for helping him get free ... saying The Worm was "the catalyst for my release."

It's shocking considering Rodman famously went on CNN and BACKED UP the case to keep Kenneth Bae in prison -- despite the fact Dennis (or anyone else for that matter) knew why Bae was being held in the first place.

Still, Bae -- who was released in 2014 -- broke his silence about his captivity to CNN ... and said he couldn't be more grateful to Rodman.

"If I meet him someday, I just want to say thank you for what he has done."

Bae said Rodman brought international attention to his plight -- which put pressure on North Korea to set him free.

Bae also said Rodman called his family after the famous rant and apologized. He considered it a "sincere apology."

Rodman's rep, Darren Prince, tells TMZ Sports ... "Dennis is extremely happy that something so positive came out of his trips to Korea and was very appreciate that Kenneth Bae thanked him today."

Blac Chyna and Tyga are putting their past on the market ... holding a 3-day estate sale, and from the looks of it everything must go.

It's not your average garage sale ... prices on items range from $500 to $1,200, including a Ms. Pac-Man arcade game, a crystal chandelier, and a marble table. There's also a bunch of Tyga's Last Kings merch, but that's not cheap either. An Egyptian statue will run ya $500.

The gloves are off ... and Michael Strahan got that message loud and clear when Kelly Ripa dropped an unscripted jab at him over divorce, TMZ has learned.

Sources connected to production tell us Ripa's intro to a segment about divorced couples was a total shock to Strahan. If you missed it -- Kelly innocently turned to her co-host and said, "So, you've gotten divorced ..."

We're told the look of shock on his face was 100% authentic.

Of course, both Kelly and Michael knew they were doing the segment, but we're told he had NO IDEA she was going to raise his divorce as part of it. If it looks like a cheap shot, that's exactly how Michael and others on set took it ... according to our sources.

Strahan played it off on the air this time, but these last 2 weeks -- before he jumps to 'GMA' full-time -- are gonna get interesting.

The customized piano Prince played at his final public performance was thiiis close to getting him to do something he almost NEVER did ... sign a big time endorsement deal.

Yamaha exec, Chris Gero, tells TMZ the company started negotiations with Prince's reps 4 months ago. The plan was for Yamaha to provide instruments and round-the-clock service for the remainder of Prince's "Piano & A Microphone" tour.

Yamaha sent Prince a $200,000 purple grand piano a few days before he died in hopes of closing the deal -- and it seemed to be working. Prince excitedly tweeted about it, and had it onstage with him when he played briefly during his Paisley Park dance party on the Saturday before his death.

Gero says all signs were pointing to them closing the deal when Prince died.

If you thought a little thing like JAIL was gonna stop Adrien Broner from bragging ... you're wrong ... 'cause the "look at me" king has something brand new to show off ... a sick Atlanta mansion.

Broner's people tell TMZ Sports this ain't a rental -- Broner BOUGHT the $6 MILLION pad himself.

The boxer unveiled the digs to the world on his Snapchat ... showing off his foyer (with a grand staircase), outdoor dining area, office, kitchen and of course, the saltwater pool.

Don Cheadle's longtime girlfriend got her hands dirty with the couple's home and the result is a modern beach pad they're hawking for $2.45 million.

Bridgid Coulter -- an actress-turned-designer -- did more than a simple flip on their bungalow in Venice, CA. For starters, she raised the ceilings, and added a second level. The crib has 3 bedrooms, 3 bathrooms and 360-degree views from its rooftop deck.

If the environment is your thing -- it has hydronic radiant heating under the floors, and remote venting clerestory windows (really fancy skylights). Plus, the yards are filled with local, drought-tolerant plants.

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