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Christina Milian and Lil Wayne still have their hands all over each other, a month after their break-up ... but it's all in a day's work.

Wayne grinded with a barely dressed Christina on the set of her new music video for "Do It." The video was shot last week in Miami and judging by photos it's hard to believe it's more business than pleasure.

Still, sources tell us they aren't getting back together, but remain friends ... so working this closely is not a problem. We're told the chemistry will always be there.

Easy to see why ...

Lyft couldn't make flying cars happen in time for "Back to the Future" Day but it created the next best thing -- McFly mode, where customers get carted around NYC in a DeLorean!!

A rep from the rideshare company tells TMZ they searched high and low for the vintage whips Marty McFly and Doc Brown rode into the future -- which is today, Oct. 21, 2015.

We're told Lyft and Verizon shipped the cars to NYC, along with their owners, who drove customers around town ... some even dressing up like McFly or Doc. Best of all -- the rides are free ... but good luck getting one.

Lyft wants to maximize customer enjoyment, so rides are limited to around 15 minutes.

Keep it under 88 MPH, drivers!

'90s kids in NYC rejoiced Tuesday night cuz the Backstreet Boys hit the stage for the Balmain x H&M fashion show.

Brian, Nick and those other guys performed some of their classics for the likes of Kylie, Kendall and Gigi Hadid. We're told Olivier Rousteing -- who designed the collection -- is a HUGE BSB fan and asked the group to close the show.

Our source says the performance was such a success Olivier and the Boys are in talks to work together on their upcoming tour.

Your move, 'N SYNC.

The Caitlyn Jenner collectible market is BOOMING ... at least one auction house is hoping it is ... selling one of CJ's used racing suits -- and they're hoping to score $20,000 for it!!!

The item is the driving suit Caitlyn (then Bruce) wore during the 1982 Celebrity Toyota Grand Prix of Long Beach ... a race Bruce dominated and won!!

The suit eventually came into the possession of a collector who has decided to sell now that Bruce has become Caitlyn and Caitlyn has become a cultural icon for obvious reasons.

A rep for Nate D. Sanders, the company running the auction, tells TMZ Sports the starting bid is $5,000 ... but they're expecting bids to reach as high as $20k.

Hope you saved up!

12:15 PM PT -- Good news for pissed off Janet fans ... an Instagram spokesperson tells us only "repeat infringers" should've had their accounts deleted, but a bug resulted in accounts getting deleted that should not have been. We're told the bug has been fixed, and IG is in the process of reinstating users who were incorrectly affected.

Together again.

If you see Janet Jackson in concert and shoot a video -- warning: keep it off Instagram or there will be hell to pay, as in ... your content being deleted out from under your nose.

Several Janet fans are claiming their IG accounts were completely taken off the grid without warning after they posted video from one of JJ's "Unbreakable" tour stops.

IG sent out an email to the account holder saying their uploads violated copyrights. Since the copyright on Janet's music would belong to her and/or her label ... it seems like her camp is behind the crackdown.

Some Janet fans aren't taking it well, since they're also losing non-Janet content. As one put it ... "Definitely boycotting Janet Jackson in concert & Instagram until this is resolved."

That might be a while. Some users got a message saying their account has been permanently deleted. Translation: Your IG friends are gonna ... miss you much.

As co-creator of "The Simpsons," Sam Simon amassed an epic collection of memorabilia ... which you can own, if you got the cash.

Simon's estate teamed up with Sotheby's for "The Creative Genius of Sam Simon: A Lifetime of Memorabilia," to auction off serious 'Simpsons' swag, and stuff from his other sitcoms he wrote and produced.

Sotheby's tells us the most sought after items include one of Simon's drawings of Bart, expected to go for $1,500 ... and an animation cell from an episode, estimated to fetch $2,000.

The crown jewel might be concept drawings of 'Simpsons' characters from the early planning stages of the show. Sotheby's thinks that will pull at least $5k.

WARNING -- Whoever put the NY Giants jersey on Philly's famous Rocky Balboa statue better watch his/her ass ... 'cause the Philly PD is calling the situation a "CRIME AGAINST HUMANITY!"

Ok, so there's no statewide manhunt for the perp or anything like that ... but people in Philly were FUMING after some G-Men fan trolled the city before tonight's Eagles vs. Giants game.

We spoke to the Philadelphia Police Dept. about the situation and the public affairs office told us, "We are aware. There's no video, no surveillance, where we could actively search for who did this."

On whether it was a crime, we were told -- "I'm not sure it's a crime. It's a crime against humanity!"

"As far as us actively investigating, no one has reported it. We're not treating it like a crime. If they wrote on it, spray painted it, that'd be a different story."

“Storage Wars: Miami” star Kevin Pew tackled and wrestled a gun out of his son’s hands after he allegedly shot and killed a family friend … this according to a police report obtained by TMZ.

The story of the shooting surfaced last week, but we've now learned the TV show was the backdrop for the violence.

Pew, his son and others were at a viewing party in Pembroke Pines, FL for the 'Storage Wars' spin-off.

Cops say the Pews and family friend Janel Hamilton were watching when Hamilton left the room to grab a blanket. They heard a gunshot, ran into the room and saw Hamilton on the floor. Kevin’s son, Hashim, allegedly walked over, fired a second shot at her and said, “She’s dead as f***, dawg.”

According to the police report, Kevin tackled his son to the ground, wrestled a .9mm out of his hands and restrained him until cops arrived and took the 23-year-old into custody.

The son has been charged with first degree murder.

Former NBA star Joe Smith is paying lyrical tribute to his fallen friend Lamar Odom ... recording an emotional song for his former Lakers teammate called "If I Die Tonight."

Odom continues to fight for his life after being found unconscious in a Las Vegas brothel Tuesday ... and, although he's shown some signs of improvement recently, a long road remains.

Smith played with Odom on the Lakers in 2010-11 and tells TMZ Sports he recorded the track hoping it would lift the spirits of everyone who cares and loves Lamar.

"I want [the song] to give the people some faith and motivation... empower them. Give them hope that Lamar's going to be okay."

Although the song seems to be asking the question of what the world would do if Odom were to pass away, Smith says reaction has been positive ... even moving some to tears.

Lamar Odom was able to breathe on his own, with the help of a mask rather than a ventilator ... TMZ has learned.

Our sources say doctors are trying to get Lamar functioning on his own, so a few minutes before this story was posted, they took him off the ventilator and put a breathing mask on Odom.

We're told doctors are putting him back on the ventilator and used the mask as a test, and they plan on going back and forth to see if Lamar would be able to breath without heavy life support.

It's another hopeful sign. As we reported, tests Friday morning revealed Lamar's heart has shown some improvement. That said, our sources were quick to add Lamar is not out of the woods by any means, and it's unclear if he'll be able to sustain breathing on his own.

Here's boxing champ Adrien Broner taking a break from spending money on cars and jewelry to donate it to a group that really needs it ... strippers.

Adrien -- who just won the WBA light welterweight title on October 3rd -- is obviously still in celebration mode 'cause he and his manager invaded Stadium strip club in D.C. and spent over $40k!!!

If the name Stadium rings a bell it's probably because it's the same place where Drake famously spilled a bunch of cash while darting into an altercation involving one of his boys last year.

We're told Broner dropped his cash squarely on the ladies ... so much so that at one point he ran out of dollar bills and began to make it rain HUNDRED DOLLAR BILLS.

Lamar Odom had hooked up with a personal trainer and was busting his ass in the hopes of making a triumphant return to the NBA ... so says Odom's trainer Fareed Samad.

Samad says he was introduced to Odom through his friend, pro boxer Zab Judah -- and they had been training together in Vegas since June.

"He was down 35 pounds," Samad says ... "We talked to the Knicks about him going back to the NBA."

Kobe Bryant left a Lakers pre-season game in Las Vegas early ... and rushed to the bedside of his former teammate Lamar Odom Tuesday night -- where he prayed with members of the Kardashian family.

Bryant and the Lakers happened to be in Vegas to play the Sacramento Kings -- but when Kobe got word about his friend, he left the MGM Garden Arena and beelined it for the hospital.

Lakers general manager Mitch Kupchak was also at the hospital with Kobe.

As we previously reported, Khloe, Kim and Kris Jenner had also rushed to the hospital to be with Lamar -- and when Kobe arrived, they all prayed together.

We're told as of this morning, Odom's condition is essentially the same ... he's in a coma and his heart is failing, but he's still alive.

Simon Cowell celebrated his 56th birthday with Ryan Seacrest, his GF ... and a 'Real Housewife.'

We're told Cowell's baby mama Lauren Silverman set up everything for the celebration dinner at Sur Lounge in West Hollywood ... where celeb guests included Ryan, designer Rachel Roy, and Lisa Vanderpump. Makes sense, since it's her restaurant -- plus, we're told LV and Silverman are longtime pals.

Seacrest surprised Cowell with a mini Maybach. The ex "American Idol" co-stars have a running joke about Cowell's 5'9" height ... which is funny, coming from Seacrest.

Based on Simon's reaction, size doesn't matter to him. Not on his birthday at least.

Gordon Ramsay had the guts to enter the grueling Ironman World Championship in Hawaii, but he ended up losing those guts ... on the side of a road.

Chef Ramsay had to drop out of the legendary race, but not before completing the 2.4 mile ocean swim. He moved on to the 122 mile bike ride, and that's when he started blowing chunks.

He tried to persevere through the final marathon leg, but went down with dehydration ... which prevented him from finishing. Medics had to come to his aid.

Ramsay's finished the race before ... in 2013 and it took him 14 hours. He says he'll be back next year.

Randy Quaid can't seem to get things right north of the border ... he was just detained in Canada and it could lead to his deportation.

Law enforcement tells TMZ Quaid was picked up in Montreal where he and his wife Evi live. It appears Evi was involved in the incident as well, she tweeted, "i love that Canada needs to learn how to wake up and criticize its crappy government ... ps we got arrested by an actual tall midget."

It's unclear why Quaid was detained but an immigration official tells TMZ he will have a detention review hearing on Thursday.

A law enforcement source in Santa Barbara -- where Quaid has several warrants out for his arrest -- tells TMZ they'll pick him up once he's brought back to the US.