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Cris 'Cyborg' Justino is already throwing her hat in the ring to be a part of the possible Mayweather vs. McGregor superfight ... and says she's down to BOX if that's what'll seal the deal.

After we broke the story that Mayweather has a $50 million offer out to Conor -- Cyborg tweeted out to Floyd saying:

"Hey @FloydMayweather if [McGregor] Fights you In Boxing I want a Boxing Fight on The event2. #mma vs #boxing u pick The girl! #tmt."

Cyborg also says she's already got a boxing coach who "will have me ready."

As we reported, nothing is in stone (or even close) but it seems like there's a real chance.

Michelle Pugh says sharing a name with the woman who's allegedly having an affair with Ozzy Osbourne has wrecked her personal and professional life.

The other Michelle, a nail tech from Washington, says she laughed off the confusion at first when friends informed her of the Ozzy and Sharon Osbourne drama, and the hairstylist with whom she shares a name.

But Michelle says things stopped being funny when she checked her social media and found nearly 100 harassing inbox messages calling her a whore, a homewrecker and shaming her for hurting Sharon Osbourne.

Michelle's been blocking and deleting the harassers but there's nothing she can do to fix the damage that's been done to her business ... due to bad coincidence. She's been building her online presence and says her websites are getting buried in search results by the other Michelle.

Katy Perry apparently has no issues with whatever happened in Vegas between Orlando Bloom and Selena Gomez, because she just pooh-pooed everyone who thought she was done or upset with her BF.

Katy posted on Thursday night, "Instead of giving energy & eyeballs to dumb conspiracy check out how COOL this is" ... linking to a Time article about Orlando Bloom helping Ukranian kids with their education.

It's so weird ... the day before she posted lyrics from Peggy Lee's song, "Is That All There Is" ... which is all about breaking up.

Love ... it's a confusing thing.

Kendra Wilkinson's not waving any white flags in her war with Holly Madison ... but she is blaming hormones for her XXX tweets at her ex-Playboy pal.

We got Kendra outside FOX News Thursday and she explained why she's on the attack, and not planning to back down.

Earlier, she went after Holly on Twitter for dissing Hugh Hefner in a People article. The tweets were extremely graphic, and Kendra's since deleted them.

But the damage is done for Holly, who tells us she doesn't want to be part of a fight where "one woman lives to demoralize and degrade another woman."

Prince is tearing KISS apart ... because lead singer Paul Stanley is embarrassed over his partner Gene Simmons saying Prince's death was "pathetic."

Stanley went so far as to apologize for his bass player ripping Prince for using drugs. Simmons told Newsweek, "How pathetic that he killed himself. Don’t kid yourself, that’s what he did. Slowly, I’ll grant you... but that’s what drugs and alcohol is: a slow death.”

Seems Paul was blindsided by the interview. He tweeted, "Embarrassed by cold clueless statements re Prince's death. Without all the facts better to say nothing. My apologies."

After Gene's interview came out, there was a backlash from many KISS fans who felt he was insensitive -- so Paul appears to be doing damage control.

Conor McGregor has NOT been added back to the UFC fight card ... this according to UFC honcho Dana White.

TMZ Sports spoke to White this morning ... who tells us, "It's not true. We haven't talked to Conor or his manager since the press conference. I don't know why he would tweet that."

Conor McGregor says he's BACK on the UFC 200 fight card ... claiming he worked out a deal with UFC honchos Dana White and Lorenzo Fertitta ... though UFC has not yet confirmed.

If true, it would be a shocking development considering White had been so adamant about Conor being OFF the card ... since he refused to show up to Vegas this past weekend for promotional obligations.

In fact, White told the media the decision to move on from Conor was final.

Still, McGregor tweeted in the middle of the night ... "Happy to announce that I am BACK on UFC 200! Shout out to @danawhite and @lorenzofertitta on getting this one done for the fans. #Respect"

So far, no word from the UFC -- or White or Fertitta.

Stay tuned ...

Joe Rogan ain't buyin' Conor McGregor's retirement tweet ... saying there's no way McGregor will hang 'em up "unless he got f*cking head kicked today and knocked into oblivion."

Rogan -- who's been the color commentator for the UFC for nearly 20 years -- was on his "Joe Rogan Experience" podcast Tuesday when the news broke about Conor's tweet and Joe's reaction was about as honest as it gets.

Rogan made a couple of interesting points ... noting McGregor was ringside at an MMA fight in Dublin earlier this month, in which a fighter was beaten so badly, he died from his injuries ... and Conor may have been affected by what he saw.

He also noted McGregor came thiiiiis close to retiring from MMA right before he got his first deal with the UFC -- because some of his close friends were having health issues.

But all that aside, Rogan says he just doesn't believe the announcement is legit -- saying, "There's no way, he'd do it like this."

Conor McGregor is either messing with his fans ... or just made one of the most shocking announcements of all time ... implying he's RETIRING.

McGregor went to Twitter and wrote, "I have decided to retire young. Thanks for the cheese. Catch ya's later."

We've reached out to Conor's camp -- so far, it's radio silence.

We've also spoken with a handful of plugged in UFC people -- and so far, no one seems to know if it's a joke or if Conor is seriously hanging it up.

Meantime, Conor is scheduled to fight Nate Diaz at UFC 200 on July 9th.

Iggy Azalea is telling all of us we should be ashamed we dare to talk about her and Nick Young, because she's entitled to her privacy ... even though she's talked ad nauseam about her relationship.

Iggy tweeted on Monday, "We are together and i would love to be given a little (a lot) of privacy on the matter."

She's incredulous the media -- including us -- have showcased her bare ring finger ... a finger that had reliably sported her engagement ring until the cheating allegations surfaced.

It's especially interesting ... She went on "Ellen" and a bunch of radio shows talking endlessly about the scandal, threatening to cut Nick's penis off, showing off her ring, and on and on.

But now she can't believe everyone bit the bait. Just amazing.

You know when people in the South say, "Bless her heart" ... but they really mean it in a condescending, insulting way???

Yeah, that's kinda how Lakers player Lou Williams sounded when we asked him about his Twitter beef with LeSean McCoy.

FYI, the beef started after Kobe's finale ... when the NFL running back referred to Williams as "Soft ass Lou."

Lou replied by essentially telling LeSean, "Say it to my face." McCoy responded by accusing him of beating up women.

So, when we saw Williams at LAX -- we had to ask him about the issue.

"We don't do beef," Williams said ... adding, "God bless that young man."

Yeah, somehow that didn't feel genuine ...

Kobe Bryant IS NOT under attack from Smush Parker ... it's an IMPOSTOR posing as the former Laker who's VERBALLY DESTROYING Mamba on Twitter ... Smush tells TMZ Sports.

Social media went crazy after @SmushParker -- an account thought to be SP's -- attacked KB hours before his final game ... saying, among other things, "F*** OUTTA HERE KOBE"

FYI -- Bryant and Parker have beefed for years ... with Kobe famously saying, "Smush Parker was the worst. He shouldn't have been in the NBA."

In other words, people weren't shocked -- just really entertained -- when Parker dissed Kobe.

Here's the twist ... we reached out to Smush, and he's adamant the account is NOT his ... telling us, "Its definitely not mines. I would love to have that account deactivated.”

So, all's peachy with Kobe? Eh, maybe not ... we asked Smush to reflect on the Mamba's career.

Jon Jones says he was the victim of RACIAL PROFILING -- claiming the cop who pulled him over for drag racing in New Mexico only targeted him because he's black.

Jones posted part of a local news report to Instagram which claims Officer Brown of the Albuquerque PD has had several complaints filed against him for racial profiling in the past ... and one person even sued him over it.

For the record, the APD has claimed Brown has no pattern of racial profiling.

But Jones says he's convinced the March 24th incident -- in which he was cited for 5 violations including drag racing -- was purely motivated by race.

"Officer Brown all over the news in Albuquerque after reporters dig up how many times he has been in trouble for racial profiling in the past. Being a father of biracial children, I'm definitely not one to pull the race card. At the same time, I'm not necessarily surprised about this discovery after the run in I had with him."

"Having him stand there, look me in the eyes and start accusing me of several things him and I both know I didn't do made me feel let down by the community, made me feel powerless, he made me feel like what was actually true had no power over him."

Jones wasn't exactly a perfect angel during the stop -- calling the officer a pig and a "f**king liar."

Jon says he was emotional and explained, "It's easier for me to understand why so many people hold resentment towards law enforcement. Officer brown almost single-handedly ruined my trust in law-enforcement."

"The sad thing about it is, I actually went to school for criminal justice, I wanted to be an officer myself. Fortunately I know better than to let one person ruin my views of a whole group. Just glad people are finally bringing light to who I was dealing with that night."

When Cody Simpson tweets, his army of fans heed the call ... 'cause just hours after tweeting to his nearly 8 million fans, hundreds of them met him on a famous beach for an acoustic jam.

The Australian pop star performed Saturday well into the evening, giving his fans an intimate concert with the stunning backdrop of Rio's Copacabana Beach.

Mini-Me is pissed ... with Verne Troyer blasting UFC star Jon Jones for using the M-word to attack Daniel Cormier ... a word that's clearly offensive to little people.

Jones hurled the insult at Cormier during their Twitter war this week -- calling him a "mental m**get"

Troyer says the word is extremely hurtful -- adding that people who use that word are "just naive and I would say stupid."

Troyer says he doesn't necessarily want an apology -- he just wants Jones to stop using the word.