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Justin Bieber has made an offer on a sprawling mansion in Calabasas, CA ... but we're told the 18-year-old is wheeling and dealing with the seller and unless the seller caves ... it may fall through.

We're told the estate is in a gated community, which is the attraction for Justin -- privacy. The downside -- Justin just turned 18 and it's kinda weird for someone his age to live 22 miles from the Hollywood scene.

Our sources say the seller was asking for around 7+ million but Justin's offer was approximately $1.5 million under that price.

The house where Michael Jackson died is up for sale ... again ... for a whopping $23.9 million.

The estate went on the market Monday and we've learned a "major celebrity" will look at it tomorrow.

We're told the realtor -- Mauricio Umansky, the CEO and co-founder of The Agency in Beverly Hills -- will ONLY show the property to serious buyers who have pre-qualified ... which means they have the dough to buy the property.

Forget "Real Housewives" ... Danielle Staub is now earning over $1,000 AN HOUR to chat on the phone with fans ... and here's a shocker, she doesn't even need to talk dirty.

The former reality villain has joined forces with a website called Dial-A-Star.com ... connecting fans with z-list celebs at a premium price ... Staub gets $18-per-minute.

And she isn't the only one cashing in ...

Tila Tequila -------- $20-per-minute
Dina Lohan ------- $18-per-minute
OctoMom ---------- $12-per-minute
Michael Lohan --- $10-per-minute

There's more ... including "Jersey Shore" cast-off Angelina Pivarnick, Charlie Sheen's tryst Capri Anderson, and Hugh Hefner's ex-fiancee Crystal Harris.

We're told the site's been blowing up since it launched last week ... with Staub taking the honors as the top earner ... raking in $6,000 in calls since the launch. Angelina and Michael Lohan are tied for second with over $3,000 each, followed by Octomom at $1,260.

First Rosie ... now TMZ has learned roughly 30 people got the chop at the Oprah Winfrey Network today ... including 2 high level execs.

Sources connected to OWN tell us ... people from at least 3 departments were let go ... including the creative services dept., integrated marketing and promo scheduling.

We're told one of the casualties was the head of the Creative Services Department. Another was the Senior Vice President of Production.

One source tells us the group included people with years of experience in the industry as well as newcomers.

The timing is interesting ... considering O just cancelled Rosie O'Donnell's show. OWN has been struggling with low ratings since its launch.

One source tells us, "It's like a ghost town over there."

We're told, "They did the firings respectfully ... brought everyone into an office individually and explained the situation face to face."

3:26 PM PST: We just got footage of Jason's naked meltdown on a public street ... pounding his fists in anger and screaming maniacally.

2:15 PM PST: Law enforcement sources tell us ... there are NO plans to charge Russell with a crime for yesterday's incident.

2:08 PM PST: Law enforcement sources tell us ... Russell is being hospitalized on a 5150 psychiatric hold so authorities can assess his mental state. The 5150 hold allows authorities to keep Russell for up to 3 days to determine if he represents a threat to either himself or others.

1:45 PM PST: The CEO of Invisible Children, Ben Keesey, tells TMZ ..."Jason Russell was unfortunately hospitalized yesterday suffering from exhaustion, dehydration, and malnutrition."

The statement continues, "He is now receiving medical care and is focused on getting better. The past two weeks have taken a severe emotional toll on all of us, Jason especially, and that toll manifested itself in an unfortunate incident yesterday."

"Jason’s passion and his work have done so much to help so many, and we are devastated to see him dealing with this personal health issue. We will always love and support Jason, and we ask that you give his entire family privacy during this difficult time.”

The mastermind behind the now-famous "Kony 2012" video was detained by police in San Diego yesterday for allegedly being drunk in public and masturbating.

Jason Russell was taken into custody by San Diego cops. In addition to allegedly masturbating, cops say he vandalized cars.

Cops told NBC7 in SD they received several calls around 11:30 AM ... reporting a man in "various stages of undress."

Sources tell us ... Russell was dancing around the Intersection of Ingraham and Riviera wearing "speedo-like underwear" ... and eventually removed the underwear and began to make sexual gestures.

We're told ... it appeared Russell was under the influence of some kind of substance.

Cops told NBC, "Officers detained [Russell] and transferred him to a local medical facility for further evaluation and treatment."

Russell is the father of two, and says he wants to have 9 more kids.

Russell is the co-founder of Invisible Children as well as the filmmaker of the ultra-viral video which has set records on the Internet -- with more than 80 million views (below).

11:30 AM PST -- Clooney just bailed out ... for $100.

8:45 AM PST -- Clooney and his dad were arrested for crossing a police line ... which is a misdemeanor offense.

Father and son were arrested by the uniformed division of the U.S. Secret Service ... but he's currently being booked into a D.C. police station.

George Clooney and his father Nick have been arrested in Washington, D.C. during a protest over the Sudan crisis.

Clooney was leading a protest in front of the Sudanese embassy in D.C. when he was hauled away by secret service agents.

Clooney's publicist Stan Rosenfield tells TMZ, "They were protesting the violence committed by the government of Sudan on its own innocent men, women and children. They were demanding they allow humanitarian aid into the country before it becomes the largest humanitarian crisis in the world."

Sources connected with George tell us he feels good about the arrest because it puts the spotlight on the crisis. Moments before the arrest, George was mobbed by reporters (below) -- claiming, he was protesting to raise awareness about the "Sudanese government committing atrocities on their own people."

We're told a dozen people got arrested including congressmen, leaders of the human rights community, Sudanese citizens, Martin Luther King III and George's father ... Nick Clooney.

Clooney recently shot a short documentary about the situation in Sudan, which he released on EnoughProject.org. WARNING -- Video contains VERY graphic content.

4:30 PM PT: The crew was assembled for a meeting where they were just told the show is cancelled. They are pissed because production was supposed to last another 8 months and they were just told they will not be getting any severance.

4:20 PM PT: We've just spoken with on-set sources, who tell us the crew has not been told their show was cancelled. They're learning it from TMZ.

HBO has cancelled "Luck" after the latest horse death.

As TMZ reported, yesterday a third horse died during production of the show, and HBO just made the drastic decision to lower the boom.

HBO released a statement that reads in part, "While we maintained the highest safety standards possible, accidents unfortunately happen and it is impossible to guarantee they won't in the future."

There has been another fatal horse accident on the set of the HBO series "Luck" -- a third horse has died, TMZ has learned.

We're told the crew was trying to get a horse out of its stable when it reared and fell back, suffering a head injury. The horse was euthanized at the Santa Anita Race Track in Arcadia.

This is the third time a horse had to be euthanized during the filming of the series, starring Dustin Hoffman.

Donald Trump's two sons went on a big game hunt in Africa, and the carnage they wrought has triggered outrage by wildlife enthusiasts.

Donald's sons -- Donald Jr. and Eric -- went on a hunting safari in Zimbabwe a year ago this month, and proudly showed off their trophy kills -- including an elephant, crocodile, kudu, civet cat and water buck.

In one shot, Donald Jr. is holding a dead elephant's tail in one hand and a knife which appears to have cut off the tail in another.

A wildlife enthusiast's website has just created a YouTube video of the slaughter expressing outrage.

As for Donald Trump, he tells TMZ, "My sons love hunting. They're hunters and they've become good at it. I am not a believer in hunting and I'm surprised they like it."

Trump added, "I know that anything they did was 100% OK in terms of the hunting community."

Taking Back Sunday singer Adam Lazzara is lucky to be alive -- after a tree literally FELL on top of him this weekend ... shattering his leg.

A rep for the band tells TMZ, Adam was at a recording studio in rural Michigan Saturday ... and he decided to step outside for a cigarette. It was real windy, and we're told a tree collapsed on the singer out of nowhere, trapping him underneath.

The rest of the band ran outside when they heard his calls for help -- but couldn't lift the tree off him ... so they called 911, and the local fire department came and sawed the tree to pieces (below).

Once freed, we're told Adam was rushed to the hospital -- where doctors put a cast on his broken leg. According to the rep, Adam's expected to be in the cast for the next 4-6 weeks.

"16 and Pregnant" star Whitney Purvis was arrested in Georgia yesterday ... after cops say she shoplifted a pregnancy test from a local Walmart ... and used it in the store.

According to the police report, the 20-year-old MTV star stashed a First Response pregnancy test in a hooded jacket ... and then "took it to the restroom with her and used one."

Purvis allegedly tried to sneak out of the store through a side door ... but she was busted by store security ... who put her under citizens arrest and called local police.

According to the report, the pregnancy test was valued at $15.98.

Purvis was hauled to a nearby police station where she was booked for misdemeanor theft by shoplifting.

More signs Arnold Schwarzenegger and Maria Shriver are reconciling -- they went furniture shopping together yesterday ... FURNITURE SHOPPING!!!

The former couple hit up The Ivy in Santa Monica for a lunch date Tuesday ... and after the meal, they walked over to a nearby furniture store and checked out some of the goods.

Arnold's probably a couch expert by now ... considering he probably slept on one for a while after Maria found out he had a love child with the former maid.

As TMZ previously reported, Maria has been extremely conflicted about going through with the divorce because of her strong religious beliefs ... and we're told she's flip-flopped on the whole divorce thing many times.

One thing is for sure, Maria is the one in the driver's seat.

Snooki was LYING FOR TWO when she denied pregnancy rumors earlier this month ... but sources tell TMZ the "Jersey Shore" star had a damn good reason -- she didn't want to jinx herself.

Sources close to the MTV star tell us ... Snooks WAS already pregnant when she went on Sirius/XM radio on Feb. 1st and told everyone she was OUTRAGED by the suggestion that she had preggo belly.

But we're told Snooki is taking the situation very seriously ... especially the taboo about revealing the pregnancy before the 3rd month.

Now, it seems Snooki has crossed the 3-month threshold ... and an official announcement could come any moment.

Marc Cherry is not Nicollette Sheridan's only adversary in her trial -- her former co-stars are poised to destroy her case, because they're all set to testify for the defense.

TMZ has obtained the witness list in Nicollette's trial. Among those who will be called on behalf of Cherry -- Eva Longoria, Felicity Huffman, James Denton, Marcia Cross and Neal McDonough.

The women on the show will all testify -- they never saw Marc strike Nicollette, as she alleges, nor did they witness any retaliation after she complained to ABC honchos.

According to the witness list, Nicollette wants to grill Marc for 8 hours.

Chris Brown has been accused of angrily snatching some girl's iPhone outside a nightclub in Miami this weekend ... and driving off with it -- law enforcement tells TMZ.

A rep for the Miami Beach PD tells TMZ, 24-year-old Christal Spann filed a police report Sunday (below) for "robbery by sudden snatching" -- claiming she followed Chris and rapper Tyga out of Cameo nightclub early in the morning (see photo above) ... and snapped a picture of Chris getting into his Bentley.

Christal told cops ... Chris flipped out when he saw her camera phone-- then grabbed it through the car window, saying, "Bitch, you ain't going to put that on no website."

According to the police report, Chris then rolled up his window and drove off -- $500 iPhone in hand.

A rep for the Miami Beach PD tells us, no arrests have been made and no warrant has been issued yet. We're told the incident is currently under investigation.

BTW, Chris is still on probation for the Rihanna beating and if he's arrested he could be thrown in jail on a probation violation.

In an unwise financial move, the wine shop next to Snooki's new Jersey City home wants nothing to do with the little booze guzzlin' blast in a glass ... and even posted a sign on the door to keep her the hell out.

We're told Jwoww ain't welcome in the store either, so the ladies will have to schlepp their bronzed behinds a little further than next door when they want to binge drink for the cameras of their new reality show.

TMZ spoke to the GM at the wine shop ... who tells us, "Even if Jwoww shows up at our front door she will not be let in."