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Noooooooooooooooo!!

It's over for Demi Lovato and UFC stud Luke Rockhold ... the two have called it quits, multiple sources connected to the former couple tell TMZ Sports.

We broke the story ... the two began dating back in the summer after meeting at an MMA gym in L.A. and went public with their relationship in November.

But things didn't work out ... and the two split.

The good news for Demi ... seems she's already rebounding with a new MMA fighter -- Guilherme "Bomba" Vasconcelos ... a Brazilian welterweight who currently fights with Bellator.

In fact, the two spent New Year's Eve together ... and then hit a movie on New Year's Day.

New year, new relationship?

10:32 AM PT -- Now this is interesting ... Kim just restored "Kardashian West" to her Twitter name, around an hour after she began going just as "Kim." Unclear why she did and then undid it.

Say goodbye to Kim Kardashian West and say hello to just Kim.

Kim just made her first real move on Twitter since her robbery back in early October, and she's lost 2 famous monikers ... Kardashian and West. She changed her twitter name to just plain "Kim."

It seems ominous on the surface, but when you look a little deeper it doesn't seem to have anything to do with her fam. She just a posted candid video of her, Kanye and the kids.

The word is ... she's trying to rebrand herself as a one-named celeb, like Oprah and Cher.

Oprah Winfrey is afraid of Donald Trump ... or at least of having any public convo about the President-elect.

We got Oprah Tuesday morning outside CBS in NYC and tried to get her insight on Trump's impending administration. Our guy posed a pretty simple question, but her reaction was kinda shocking ... considering she's who she is.

You'd think she fears no one, but it's clear O wants NO part of a White House backlash.

Chris Brown wants to go toe-to-toe with Soulja Boy in a boxing ring, and it's all over a photo of Karrueche Tran.

Soulja says the beef all started when he liked a pic of Chris' ex, Karrueche, in a bikini. He says Chris hit him up, and threatened to whoop his ass.

It all sounds like some high school crap, but Chris is actually doubling down now, and reaching out to Adrien Broner to set up a charity boxing match.

His rant is awesome because as pissed off as Chris is, his priority at the moment was hooking up ... but he was way more blunt about it.

For what it's worth -- Soulja's been liking KT's pics for a while now, but she told us ... it ain't happening. Feel better, Chris?

Johnny Manziel's New Year's Day party exploits have caught the attention of prosecutors in Dallas -- after he was seen clubbing at the same place as his ex-girlfriend, Colleen Crowley.

Lisa Marie Naegle's death certificate is filed, but it doesn't make it clear how the "Bridalplasty" contestant died.

TMZ obtained a copy of Naegle's

-- filed by the L.A. County Coroner -- and says the cause of death of has been "DEFFERED."

We broke the story ... Jackie Jerome Rogers was charged with her murder after confessing to cops. He allegedly smashed her in the head seven times with a hammer after they'd been out partying together.

Story developing ...

The guy who turned Tinseltown into a beacon for pot might have revealed himself by slapping his signature on the evidence ... with an attribution to Jesus.

Zach Fernandez -- who goes by "jesushands" on social media -- has his handle all over the iconic sign, which was changed to read "Hollyweed" over the weekend .... the day recreational pot became legal in CA.

He's also taking credit on Instagram for the now epic stunt. Fernandez posted a pic of the Hollyweed sign, saying "In all its glory" ... and tons of people gave him props for the stunt. And it's more than interesting ... he's acknowledging the back pats by saying mission "completed."

Fernandez has not been nabbed ... but cops are on the hunt. Whoever did it faces misdemeanor trespassing charges.

Who knew English TV had this kind of money? "Celebrity Big Brother" UK is paying Ray J $1 MILLION to do the show.

TMZ has seen paper proof producers are shelling out the cash for Ray ... and that's not all he's getting. They're giving him up to $30k to fly back and forth, but that includes his hotel.

Judging from the pic after he signed the deal, Ray is rolling in the dough.

The show begins airing live Tuesday night.

Kanye West, Kim Kardashian and their kids all touched down in L.A. Monday night after a very timely New Year's trip to visit the grave site of Kanye's mother.

The Wests stepped off their private jet -- with Saint and North in tow -- after traveling to Oklahoma City. We're told it was the first time Kanye had taken the whole family to see where Donda West is buried.

They hooked up with other members of the West fam as well during the trip.

Kanye's been very present with Kim and the kids over the last weeks as he recovers from his breakdown -- and we're told this family pilgrimage was extremely important to him.

Janelle Monae says gospel singer Kim Burrell has been 86d from "The Ellen DeGeneres Show" in the wake of her homophobic rant.

Janelle told our photog at LAX Burrell sunk herself with an anti-gay church sermon last week.

Kim did a duet with Pharrell on the soundtrack of "Hidden Figures," so she was supposed to sing it with him on Ellen's show this week ... and Janelle -- who's one of the movie's stars -- is also set to be a guest. Now, Janelle says it'll just be her and Pharrell.

Janelle also has some choice words for Burrell.

As for Ellen ... she confirmed Janelle's remarks Tuesday morning on Twitter, saying "For those asking, Kim Burrell will not be appearing on my show."

Carrie Fisher's family is on the hunt for the off-duty emergency workers who came to her aid on a United jet when her heart stopped.

Family sources tell us ... they believe 2 people on Carrie's flight deserve a big thank you for their valiant effort. Flight attendants jumped on the P.A. asking for medical professionals to come forward ... and they did.

We're told these 2 volunteers -- one of whom is a nurse -- "worked like crazy" to keep Carrie alive, despite the fact they couldn't get a pulse for more than 10 minutes. The family believes if it wasn't for them, they wouldn't have had a few extra days to say goodbye.

The family will contact United to see if they can locate the passengers.

Donald Trump has made a lot of promises this year, and an old signed copy of his book shows he's true to his word ... certainly when it involves his hair.

Gary Zimet is selling an autographed "The Way to the Top: The Best Business Advice I Ever Received" book for $18,000 on his site, MomentsInTime.com. He tells us the book came from a man who attended a Trump speaking engagement in 2005 and asked the Donald to sign it for his wife Carol ... who loved his hair.

George Michael donated thousands of dollars so a stranger could have a baby ... according to the woman on the receiving end of his charitable effort.

Jo Maidment appeared on the UK's "This Morning" to share the secret she says she's kept for a long time ... George paid for her IVF treatment years ago.

After coming on the same show in 2010 to talk about how expensive IVF is ... she says an anonymous businessman called into the clinic to donate 15,000 pounds in her name.

Jo never knew who was behind the donation until after she gave birth to her first kid in 2012. She says she got flowers with a card ... from none other than George.

D.L. Hughley wants everyone crying about his "insensitive" Debbie Reynolds joke to look at themselves first -- stomaching Donald Trump's proof America's not so sensitive.

We caught up with the comedian Monday in L.A. where we asked him about the backlash he got after cracking a joke about Debbie's death.

D.L. couldn't care less.

Kareem Abdul-Jabbar was off the mark in his scathing critique of "The Bachelor," because love blossoms the same way on TV as it does in real life ... so says a contestant.

We got "Bachelor in Paradise" star Jared Haibon -- who's been on 2 seasons of "BIP" and 1 season of "The Bachelorette" -- and he says the idea that people aren't their true selves on the reality shows mirrors what happens with everyone on a date ... they put on a good but sometimes false face.

Jared's got a point ... but it seems like Kareem was getting at something a lot deeper than being phony for the cameras. Kareem rails on the shows, saying it portrays "cartoonish physical and mental restrictions" on relationships. He also comes close to calling the shows racist, saying, "If you're black ... you're usually kept around as a courtesy for a few weeks before being ejected."

Joe Mixon's parking ticket drama is officially CASE CLOSED ... with officials telling TMZ Sports the disgraced Oklahoma running back will NOT be charged for allegedly using the ticket as a weapon during an incident last month.