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Reese Witherspoon is clearly over the fact that an Atlanta cop obstructed her justice, because she showed up at LAX last night -- which is on American soil -- sporting an Atlanta PD hat.

That hat is beyond.

Paris Jackson spent most of Saturday with her biological mother Debbie Rowe -- looking at horses, playing with her hair ... real mother/daughter stuff -- and what's particularly interesting ... they were hanging the same day as grandma Katherine Jackson's birthday.

Paris and Debbie were way out in Palmdale, CA where Debbie lives -- so if Paris saw Katherine at all yesterday ... it wasn't for long.

Prince Jackson is stepping up his game -- after first being seen with his new Kuwaiti princess girlfriend out for a daytime bowling date, he then graduated to a Hollywood dinner date ... and now he's graduated to the Rolling Stones concert last night at Staples Center.

With Rihanna in New York City on her Diamonds World Tour, Chris Brown celebrated his birthday at Emerson nightclub in Hollywood ... with ex Karrueche Tran in attendance.

We're told Karrueche -- Chris' other on-again/off-again girlfriend -- was invited by Chris himself to the party (thrown by ZING Vodka and Black Pyramid) to celebrate Chris turning 24. Our sources say the two still talk often and hang out, and that she still cares about Chris very much.

Here's to hoping some combination of these crazy kids can make it work.

Even after her XXX sex tape, "Teen Mom" Farrah Abraham still can't get enough pole.

The 21-year-old once again showed off how limber she is -- only this time fully clothed -- by flaunting her stripper pole skills at a dance class in Austin on Thursday.

After scoring in the high six figure range for her highly anticipated porn debut in "Farrah Superstar: Backdoor Teen Mom," we're told the fame hungry star now wants to put her back into making a pole-dancing exercise video for new moms.

With no signs of Justin Timberlake, JC Chasez or the other guy, former *NSYNC boy banders Joey Fatone and Lance Bass -- along with LB's boyfriend Michael Turchin -- reunited to celebrate the last day of April with some lunch in Beverly Hills on Tuesday.

Decked out in her finest Rihanna chic, Miley Cyrus showed off her long lean 20-year-old legs in a pair of leather short shorts and killer heels as she pumped gas in Studio City on Tuesday.

Rob Kardashian has just been sued for allegedly assaulting a photographer and stealing her camera equipment ... as she was lying in wait to get pics of the shirtless wonder.

TMZ broke the story ... the photog filed a robbery report last month, claiming Rob jacked part of her camera at a West Hollywood gym ... and she claims it was all because she snapped shirtless pics of him.

The photog -- not a TMZ employee -- says Rob, who is neck deep in a weight loss program, snatched the memory card out of the camera.

Andra Viak's lawyer, George Gallegos, tells us, "While this case is still in the preliminary stage, it is clear from our investigation that Robert Kardashian’s violent behavior and his use of force towards Ms. Viak was completely unjustified.”

Like a lot of sunbathers in Europe, Bruce Jenner went topless on the beach in Greece on Monday.

Throwing modesty out to sea, the 63-year-old showed off his smooth and supple Olympic gold medal-winning chest and rippling abs while paddleboarding in a pair of festive high-waisted board shorts on the Aegean Sea.

Kendall isn't the only Jenner showing off in a bathing suit.

Newly single Julianne Hough and her "Vampire Diaries" star BFF Nina Dobrev like to french ... braid their hair on the beach.

In a scene straight out of a porn film -- minus all the nudity and sex -- the orange bikini babes engaged in an innocent three-way hair braiding session with a third adult female friend while bronzing their supple flesh on a public Miami beach.

Moments after tying the knot in a lavish wedding to his new hot wife Yvette Prieto, Michael Jordan was spotted making a quiet exit in a classy white Rolls-Royce in Palm Beach, FL this weekend.

Coldplay lead singer Chris Martin proved being married to the World's Most Beautiful Woman can be a hairy situation ... by going shirtless in London this weekend.

The pasty 36-year-old Mr. Gwyneth Paltrow showed off his surprisingly fit and hirsute hipster torso on what must have been a rare warm and sunny spring day in England.

No word if he was wearing underwear underneath his outfit.

Michael Jackson's famous daughter/plaintiff, Paris Jackson, spent time with her biological mom Debbie Rowe, on the eve of what promises to be a very difficult wrongful death trial.

As we first reported ... Paris has bonded with Debbie after years of separation. The 2 are spending a lot of time together, and we're told both genuinely want the mother-daughter relationship they never had while Michael was alive.

Speaking of Michael, the family's wrongful death trial kicks off today. Katherine Jackson and MJ's 3 kids are suing AEG Live, claiming the company was negligent in hiring and supervising Dr. Conrad Murray -- who killed the singer with a massive overdose of Propofol.

MJ's family will have an extremely difficult time winning this case, for the following reasons:

-- MJ had a doctor-patient relationship with Murray before AEG came into the picture. Jackson first hired Murray to treat his kids, and then used him for personal issues. Murray had given Jackson Propofol before AEG was involved.

-- MJ was a drug addict who had doctor-shopped for Propofol for well over a decade. He knew the drug so well, he often wanted to help in the administration of the drug.

-- MJ was secretive about his relationship with Murray, never telling anyone from AEG or the "This Is It" honchos that Murray was fueling him with Propofol almost every night for 2 months.

-- AEG execs are not doctors, and arguably they're in no position to tell a doctor what to do.

On a day meant to celebrate love, commitment, honesty and faithfulness ... Michael Jordan chose to invite the man who has come to symbolize the OPPOSITE of all that, Tiger Woods, to his wedding.

With his wife in rehab and his marriage in crisis, Clint Eastwood was seen on the streets of New York yesterday ... not wearing his wedding ring.

As TMZ first reported, Dina Eastwood checked into rehab for help with depression and anxiety ... which we're told was fueled by trouble in her marriage to Clint.

Taylor Swift is a certified BALLER -- TMZ has learned that not only did she just buy a Rhode Island mansion for $17 million ... but she did it with straight cash, homey!

As TMZ first reported, Swift was eyeing the 11k-plus-square-foot mansion for a few weeks now, having toured the place back on April 15.

According to our real estate sources, the asking price on the house (which sits on 5.23 acres) was around $20 mil, but Swift got it for $17.75 mil.

We're told Swift wired the money over and movers were spotted at the house early this morning.