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Young Buck threatened to burn down his ex-girlfriend's apartment ... according to cops in Tennessee.

Law enforcement sources tell us YB was picked up after his ex-gf reported the rapper texted her the threat on Wednesday ... then showed up at her apartment, kicked down the door, but left without disturbing anything inside.

Cops arrested him on Thursday. He was in custody for a few hours before being released on a $5k bond.

We're told Young Buck is currently on federal probation, and this arrest could mean he'll be busted for a violation.

One of the hackers responsible for the wave of celebrity nude pics on the Internet is sitting in a federal prison cell.

Andrew Helton got 6 months behind bars after admitting he hacked into hundreds of email accounts and jacked 161 nude and explicit images from 13 victims. Federal authorities did not specify who Helton's victims were.

Celebs like Gabrielle Union, Jennifer Lawrence, Kate Upton and Hope Solo were among the victims when the so-called "fappening" went down 2 years ago.

After he gets out of prison, Helton will also serve 2 years of supervised released.

Dani Mathers -- the Playboy Playmate who took a picture of a naked woman in an L.A. gym -- has hired no less than the famous lawyer who got Michael Jackson acquitted ... and she has reason for worry.

We've learned Mathers hired Tom Mesereau, who not only got MJ off ... he won a murder acquittal for Robert Blake.

TMZ broke the story, the LAPD launched a criminal investigation after the gym where the photo was taken filed a police report. Mathers not only snapped the pic in the locker area, she shamed the woman by writing a snarky caption and posting it on social media.

Our LAPD sources say they are on the hunt for the victim and are working closely with LA Fitness execs, combing over surveillance video and checking member swipes during the time in question to ID the victim. And, we're told, they're close.

Our sources say the LAPD would like to present a criminal case to the L.A. City Attorney but need the cooperation of the victim.

Calvin Harris works out like a real-life pro athlete ... so says Minnesota Vikings safety Antone Exum, who says the DJ blew him away during a Thursday gym sesh.

Prince George looked rather fetching on his 3rd birthday.

Prince William and Kate Middleton shared new pics of the little guy to mark Friday's occasion.

Amber Heard -- who's in the throes of a divorce with Johnny Depp -- is spending a lot of time with a guy who makes Johnny look like a pauper -- billionaire extraordinaire Elon Musk ... TMZ has learned.

Our sources say Amber has known the Tesla inventor for several years, but in the last few months they've been spending a lot of time together.

Just last weekend Amber and her sister were hanging out in Elon's hotel bungalow in Miami. We're told she had a 1-on-1 dinner at his L.A. house 2 weeks ago. We're told she recently went to Elon's L.A. area office to spend time with him. And we're told he's paid several visits to her home.

No one in Amber's camp is calling it "dating," but we're told the amount of time they spend together has definitely increased.

Elon -- who's worth an estimated $12.7 billion -- is also going through a divorce with Talulah. They married, divorced, remarried and she filed for divorce for a second time in March.

Suge Knight is in the middle of a family war ... behind bars.

Suge, who hasn't been allowed to see his family for months, had petitioned the judge in his murder case to restore visitation privileges for his 7 kids and 2 baby mamas.

The judge is allowing Suge's 4 minor kids to visit him at L.A. County Jail, but is not allowing their mothers to accompany them.

Suge's baby mama, Toi, took their 6-year-old son, Legend, to the jail Thursday to visit him, but it became a classic catch-22. The jailers refused to let Toi in, but then denied Legend access because he wasn't accompanied by an adult. We're told Toi went crazy. And we got video of Legend, who was clearly upset.

French Montana's ready to drop major cheddar on a new pad really close to his hometown, but far, far away in terms of real estate prices.

Sources tell us the Bronx-raised rapper went shopping earlier this week as a first-time buyer on Manhattan's West Side. We're told John Lecce, of Batra Real Estate Group, showed him luxury high-rise condos in the $5-10 million range.

French is considering cribs in the SoHo, Tribeca and West Village neighborhoods.

Looks like he'll be bicoastal, since he just bought Selena Gomez's old mansion for a little more than $3 mil.

As far as when he'll pull the trigger in NYC, we're told he's in no rush and willing to wait for the right location ... location, location.

PayPal co-founder Peter Thiel delivered a few lines at the Republican National Convention Thursday that were met with a surprising and even shocking reaction from the crowd.

Thiel is the first openly gay speaker at a Republican convention who addressed LGBT issues. He conceded the party platform was not his vision. In fact, the platform, which among other things seeks to repudiate the right of gays to marry, is considered by many draconian and hostile to the LGBT community.

Jay Mohr has filed for divorce from Nikki Cox, but we're told it could go the way of Patrick Dempsey.

Mohr filed legal docs Tuesday to end his 9-year-marriage and followed up with an emergency petition Wednesday for full physical custody. In his papers, he claimed Nikki suffers from depression and self-medicates and he worries their 5-year-old son might be at risk if left alone with her. The doc say the drug problem is "serious" and "ongoing."

The judge said he wanted to hear from both, so set the hearing for next month.

In the meantime, Jay and Nikki told us Thursday, "We are very married. Very in love. Very happy and that's really all there is." Translation ... they're trying to work it out.

Quentin Tarantino had his "Kill Bill" kicks on full display Thursday afternoon for a lunch meeting at the Chateau Marmont.

Ted Cruz hasn't settled on who's getting his vote, and maybe that's why he told our photog he'll be on a couch in front of a TV watching Donald Trump's acceptance speech.

Our photog got Cruz at the Cleveland airport, beating a hasty retreat after Wednesday night's speech.

We also asked Cruz ... by going back on his word to support the nominee, has he earned the name "Lyin' Ted?"

Iggy Azalea's not about to let any dudes swipe right (or left) on her ... not yet, anyway.

We caught up with the rapper Thursday morning at LAX and asked if she's trying her hand at online dating. You gotta see the vid for her reply, and also for her sick side-eye.

One thing Iggy does have her mind made up about -- breakfast!

Celine Dion is open to working with Britney Spears and J Lo, but the chances of the 3 Las Vegas headliners actually uniting on a project are slim.

Celine is in NYC and explained to our photog why she doesn't see it happening. Everyone knows CD's a major diva ... but her reasoning actually isn't.