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Someone's been sleeping in Jennifer Lopez's pool house, and it ain't Goldilocks -- cops arrested an alleged stalker who somehow managed to live in the pool house of her massive Hamptons mansion ... for several days ... without getting noticed.

According to Southampton police, 49-year-old John M. Dubis basically moved in to J.Lo's $10 million pad sometime in early August.

He reportedly walked around the estate freely, hanging out openly in view of neighbors... and even posted Facebook photos of himself all over the grounds, such as the one below -- before police finally busted him on Aug. 8.

And how's this for weird ... two days before his arrest, Dubis dropped by a nearby menswear store and purchased a plaid overcoat.

Jennifer was not home, but the shocking part is security guards were patrolling the property.

Of course, you have to remember the 8,500 sq. foot home sits on 3 acres -- and it's a decent hike out to the pool house from the main quarters.

Dubis was booked for burglary, stalking, and criminal contempt. He pled not guilty, and is currently sitting in jail in lieu of $100,000 bail. The judge has ordered a mental evaluation for Dubis.

Things got real cheeky between NYC mayor hopeful Anthony Weiner and his latest sexting partner -- TMZ has obtained a pic she sent to him on Facebook ... showing off her ass in a thong ... and that's just the beginning.

23-year-old Sydney Elaine Leathers tells TMZ she sent the photo to Weiner in July 2012, modeling a cheeky-cut lace thong (good choice) ... in what appears to be her bathroom (bad choice).

Weiner admitted yesterday he sexted long after he resigned from Congress in 2011, but finally nipped his sexting problem in the bud last summer ... around when Leathers sent the thong photo.

Leathers says ... Weiner was very persistent in his naughty picture requests, asking her to send all sorts of naked photos ... more than 30 in total. But we're told Weiner also has a foot fetish, and regularly asked for pics of Leathers' feet in heels. Of course, this was all allegedly in exchange for pictures of his own naked ... weiner.

And the relationship wasn't just online either, we're told Weiner regularly spoke to Leathers on the phone -- in fact, Weiner was adamant about speaking to her because he enjoyed telling her about his sex dreams ... most of which involved her. Shower sex was allegedly one of his favorite topics ... his wife, Huma, was not.

As we reported, Weiner now claims the entire sexting debacle "is entirely behind me," and that he's moving full steam ahead with his mayoral campaign. Good luck with that.

DJ Baauer – the guy behind the insanely popular viral hit "Harlem Shake" – is being sued by a photographer who claims Baauer engaged in some serious Facebook deception, TMZ has learned.

Photographer Dustin Kessler claims Baauer, aka Harry Bauer Rodrigues, hired him for a photo shoot last year and then asked for permission to use two of the photos; one for a Facebook profile pic ... the other for a magazine article.

Kessler says he agreed to the terms, but then started seeing his photos showing up all over the place, in print and online magazines like Rolling Stone, Spin and Billboard as well as ads for Coachella … and even on Baauer’s own website.

Kessler says he never got credit OR money for any of his photos. So he’s suing Baauer – claiming the DJ is partly responsible for the widespread unauthorized use of his pics. Kessler is also suing the media outlets which allegedly ran the pics without permission.

Kessler is demanding a jury trial and is seeking unspecified damages.

Meantime, here's the Miami Heat shakin' things up ...

TMZ Photog: "How excited are you for your daughter -- she's about to get married and stuff?"
Bobby Brown: "I'M NOT."

That basically sums up Bobby B's feeling about his daughter Bobbi Kristina getting engaged to Nick "He's Not My Biological Brother" Gordon.

Bobby made it clear he doesn't approve ... and reveals that Nick never even called him up to ask for her hand in marriage.

The Brown family isn't exactly the tightest bunch -- Bobbi Kristina doesn't talk to her dad, so why would Nick?

Still let's recap ... the not-official brother didn't call his quasi step-dad to ask permission to marry his kinda-sister.

Despite the bitterness, Bobby tells TMZ ... "I just want her to be happy."

We broke the story, Bobbi K revealed the engagement on Facebook last week ... and though Whitney treated Nick like a son growing up, he's not a blood relative and was never formally adopted.

Kris Jenner pulled out the big guns for her talk show premiere -- 'cause Kim Kardashian's baby North West will make its debut ... is what she wants you to believe -- BUT TMZ KNOWS IT'S NOT!

Kris' show posted a photo on Twitter and Facebook ... of herself cuddling an infant, with the message ... "You never know who will stop by our show today #WatchKris".

This would be the first public shot of North since her birth -- but we smelled a rat. And guess what? After some digging we found out the baby is owned by a hair and makeup person on the set.

Kanye West and Kim have been pretty clear about NOT wanting their baby in the spotlight.

Put away the bottles of bub ... 50 Cent has just been dropped from MLB.com's upcoming All-Star Bash in NYC in the wake of his domestic violence scandal, TMZ has learned.

TMZ broke the story ... 50 was charged with domestic violence last week following the alleged domestic dispute at his baby mama's house in California in June, during which he allegedly kicked her and destroyed a bunch of her property (more than $7,000 worth).

50 was supposed to perform at the MLB.com party on July 14th along with Kaskade, but sources tell TMZ, MLB officials decided not to move forward with the alleged GF-kicker.

50's name appeared on the original flyer for the event ... but the event's Facebook page is now updated, and advertises 2 "surprise performances" for the party.

MLB hasn't returned our calls to confirm 50 was cut as a direct result of the domestic violence charges.

Status Update: Facebook COO Sheryl Sandberg was almost a passenger on the plane that crash landed in San Francisco today ... but a last minute decision to change flights spared her and her family a harrowing ordeal.

Sanderg posted on her FB page (where else?) that she switched flights at the last minute so she could use her airline miles to pay for her family's tickets.

She explained, "Our flight was scheduled to come in at the same time, but we were early and landed about 20 minutes before the crash."

Paris Jackson's deep depression has been largely the result of bullying ... and Facebook has been hosting the haters.

Sources closely connected to Paris tell TMZ ... the 15-year-old has been reeling from comments left on her Facebook page --- many about Michael Jackson and his lifestyle. Some of the comments involve the various molestation allegations ... others involve the odd life Paris lived while Michael was alive.

We're told Paris has taken the comments very personally ... and one source says, "They destroyed her." The source adds, there's a nexus between the bullying and her penchant for cutting.

Now here's the problem. Paris does not have access to her Facebook page while she's in the psych ward at UCLA Medical Center. But her family is deeply concerned that she'll backslide if she goes back on Facebook when she gets out.

The family is extremely frustrated, because they've tried to shut down Paris' Facebook page, but they can't --- Facebook's policy is that the family of a user has no right to shut down an account if the user is 13 years of age or older.

Paris' family believes Facebook could create yet another tragedy in the Jackson family, but they're powerless to do anything about it.

Sean Parker's massive $10 million wedding was a MENACE to sensitive fish and plants in Big Sur ... and he NEVER got proper permits for any of it ... so claims wildlife officials who have settled with the Facebook billionaire for $2.5 million.

Parker struck the agreement with the California Coastal Commission after agents were tipped that he built a wedding site the size of a massive movie set in an ecologically sensitive area -- cabins, dance floor, staircases, waterfalls -- all without permits.

By the time coastal officials investigated, the structures had already been built ... but they let the wedding go on as scheduled. The 33-year-old Parker tied the knot Saturday with singer-songwriter Alexandra Lenas.

After the shindig, the commission had the structures taken down with no damage to the area ... they also said Parker was super cooperative.

If you invested in Facebook, here's another reason to unfriend Fbook billionaire Sean Parker -- he's blowing nearly $9 mil to create a temporary backdrop for his wedding.

We've learned Parker -- who made billions with companies like Napster and Facebook -- booked the entire ultra-swank Ventana Inn in Big Sur, CA for the weekend of June 1st to tie the knot with Alexandra Lenas in an over-the-top wedding with a medieval flair.

To realize his vision ... we're told Sean hired a landscaping company to build fake ruins, waterfalls, bridges, ponds and a gated cottage in the resort's surrounding forest -- where he'll say "I do" in a ceremony fit for a king ... or Hobbit.

All the guests will enter through a $600,000 gate, dance on a $350,000 floor, and they better stop and smell the roses ... because Parker's dropping more than $1,000,000 on plants and flowers!

Throw in a bunch more fancy overpriced decorations ... and grand total for the BACKDROP is $8.6 million.

In case you care ... Sean hired the costume designer from "Lord of the Rings" to make threads for his guests ... and like yarmulkes at an Orthodox Jewish temple ... you can't get in without 'em.

Now the kicker ... the entire backdrop will go in the dumpster immediately following the shindig.

Facebook founder Mark Zuckerberg is white hot -- exposing his burly man chest while vacationing in Maui.

Zuck wasn't shy about sharing his topless physique while taking his wife Priscilla Chan out for a private surf lesson.

See, there is something $14 billion can't buy.

Jewish organizations around the world are furious with the Ukrainian government ... after a Ukrainian politician used an Anti-Semitic slur in a Facebook rant about Mila Kunis.

The man who set off the controversy is lawmaker Igor Miroshnichenko -- who had written that Mila (a Jew who was born in the Ukraine) is not a true Ukrainian because she's a "zhydovka" ... a word that has been used as a slur against Jewish people since the Holocaust.

After protests by Ukrainian Jews, the Ukrainian government announced the word was OK to use because it appears in the Ukrainian dictionary as a term for a Jew that isn't necessarily a slur.

Now, the famous Simon Wiesenthal Center in L.A. is getting involved -- firing off a letter to the Prime Minister of the Ukraine to "express our outrage and indignation against the slanders of the Svoboda Party directed against the Jewish community in the Ukraine."

In the letter, Rabbi Marvin Hier explains ... the term "zhydovka" translates to "dirty Jewess" ... and was used as an "insidious slur invoked by the Nazis and their collaborators as they rounded up the Jews to murder them at Babi Yar and in the death camps."

The org. has called on the Prime Minister to "publically condemn this attack and to take measures to defeat the xenophobic forces that threaten your democracy."

The Winklevoss twins may have sued Mark Zuckerberg, claiming he was a fraud and a thief ... but they believe in him enough to hold on to almost all the stock they have in the company, even though they're now legally entitled to unload it.

The twins own close to 6 million shares of FB stock -- now worth around $125 mil -- and they were free to trade their stock starting today. But we've learned ... they will only unload $1 million worth of stock, which they will use as seed money to fund their new venture -- an e-commerce website called Hukkster.com. The website tracks your favorite products and alerts you when they go on sale.

FB stock is now trading at an anemic $22.15 -- a far cry from the $38 IPO price.

Nonetheless, you could say the twins still believe in Mark Zuckerberg.

Dr. Paul Nassif's lawyer tells TMZ, his client absolutely, positively did NOT inflict the bruises and marks depicted in disturbing photos released by Adrienne Maloof's personal chef.

Adrienne's chef Bernie Guzman -- who has appeared on several episodes of "Real Housewives of Beverly Hills" -- just posted the eight photos on his Facebook page, strongly insinuating Paul is responsible for the injuries.

Bernie wrote several messages on his wall as he posted the photos, saying, "ADRIENNE MALOOF WAS PUSHED TO THE GROUND. PUNCHED & BEATEN ... HE IS A BEAST."

Bernie goes on: "THIS IS ABOUT SAVING THE LIFE. OF A MOTHER AND HER CHILDREN ... EVERYONE NEEDS TO SEE THESE PICTURES ... NOW!"

Dr. Nassif's lawyer, Marty Singer, tells TMZ, "Any suggestion that the photos show my client struck Adrienne Maloof is a complete fabrication." Singer goes on, "No physical assault ever occurred."

Former "American Idol" contestant Brittany Kerr has shut down her Twitter page ... after a gang of angry Jason Aldean fans BLASTED the singer online -- calling her everything from a "skank" to a "homewrecking whore."

The cyber-hate came flooding in after TMZ posted the pics of Aldean -- a huge country singer who happens to be MARRIED -- putting the moves on Kerr at a crowded bar on the Sunset Strip.

Sources connected to Kerr tell us ... she had NO IDEA Aldean was married ... and if she would have known, she would have shut the whole thing down from the start.

Even though Kerr didn't go home with Aldean, people attacked her online ... writing terrible things on her Facebook page including:

"Disgusting homewrecking tramp!"

"what is wrong with you taking advantage of a married man while he was drinking."

For the record, people have ripped Aldean on his Facebook page too. He has since apologized, chalking the whole thing up to a bad drunken decision.

Kevin Systrom -- who co-founded Instagram and then sold it to Facebook for $1 billion -- isn't just a tech-genius, he also moonlights as a DJ ... and we have pics to prove it.

Systrom was in Las Vegas last night, partying his face off with about 30 of his new FBook buddies -- when he started DJ'ing a set at Rain Nightclub in the Palms Hotel.

This isn't Systrom's first go at spinning records -- he reportedly moonlit as a DJ back in his Stanford days.