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Paul Walker will be remembered by thousands of auto enthusiasts this weekend with a huge, noisy car rally ... but TMZ has learned law enforcement will be out in force ... gunning for any reckless drivers.

The car meet is scheduled to begin at noon on Hercules Street ... near the spot where Walker and Roger Rodas died in the fiery crash of their Porsche Carrera GT last weekend.

More than 20,000 people are expected to show up -- that's a lot of vehicles. City officials are urging locals to avoid the area altogether.

Law enforcement sources tell TMZ they'll be ready for trouble, too ... with a highly visible police presence to make sure the event goes off safely.

Justin Bieber and his entourage were detained at the Brisbane, Australia airport while customs agents looked for drugs ... and TMZ has learned they allegedly found weed on one of Justin's pals.

The Australian Federal Police tell us ... a 19-year-old man was detained back on Nov. 24 ... but was released after getting a stern warning for using "inappropriate language." He reportedly swore at the officers.

Sources connected with the incident tell us Justin was the one with the potty mouth.

The AFP says a security check turned up an unknown amount of pot on a 23-year-old man in Justin's entourage. The suspect was released, but got a ticket for allegedly importing drugs.

Sources close to Justin tell us the suspect had a disposable vaporizer -- basically an electronic device to smoke marijuana -- which had residue in it.

We're told an attorney for the suspect appeared in court today, and paid the fine.

It's been one helluva tour -- as we first told you ... one of JB's bodyguards was arrested last month in Hawaii after allegedly attacking a photographer on the beach -- and was also caught on video attacking a photog in Sydney.

Lindsay Lohan won't put her ass on just any piece of furniture ... that's why she packed up her crappy old sofa and banished it from her swanky NYC apartment.

A moving truck and crew pulled up to Lilo's chi-chi SoHo crib yesterday -- which led to speculation she was moving out -- but sources tell us they were simply there to load up the old couch and deliver a brand spankin' new one.

Sources say Lindsay's been living in the $16,000 a month pad while shooting her docu-series for Oprah Winfrey's cable network -- so the apartment doubles as a set for the show.

Keri Russell had a frightening wake-up call early this morning ... when she awoke to intruders burglarizing her home ... TMZ has learned.

Law enforcement tells TMZ ... the "Felicity" star was awakened about 3 AM this morning in her NYC townhouse when she heard noises upstairs. She got up to investigate and discovered her living room window and front door were wide open.

According to police, the thieves escaped ... and Keri reported they made off with a Filson handbag, a laptop computer and a necklace.

Seems Charlie Sheen has a brand new girlfriend ... 'cause the Warlock was open-mouth kissing a hardcore porn star over Thanksgiving weekend ... and it looks like it was more than just a hookup.

The porn star on the receiving end is 24-year-old Brett Rossi -- star of such flicks as "She Loves My Big Breasts 2" and "Bondage Tongue Bath."

The two were spotted swapping spit in Cabo a few days ago. We're told they met in L.A. last month and Charlie took her to Mexico to celebrate Thanksgiving with a few other friends.

Rossi's the classy kind of porn star too -- as far as we can tell, she doesn't really do hardcore male-female sex scenes ... mostly just solo and girl-girl stuff with the likes of Twistys and Penthouse.

As for the other women in Charlie's life -- you know, the three "Angels" he's dating -- we're told Charlie's still with them, too.

The more, the merrier.

Video has surfaced allegedly showing one of Justin Bieber's bodyguards attacking a photog's car in Australia ... and it's crazy.

The video was shot last night in Sydney. According to the photog, he was following Bieber's car when it pulled over and one of the singer's bodyguards hopped out, demanding the pap buzz off.

You can hear the heated exchange as the photog refuses to go anywhere -- and then you can hear several loud banging noises. The photog says, "He just kicked the door."

Justin is not visible in the video. The photog claims the man also knifed his tires, but you can't see that in the clip.

Sources tell TMZ, the bodyguard in the video is the same bodyguard who allegedly attacked an Australian surfer the day before ... for trying to take a photo of Bieber surfing.

Like a dog leaving its scent, Justin Bieber is leaving his mark all over the world ... 'cause he just tagged up another city, and this time he was caught in the act ... on camera.

Bieber -- who spray-painted his way across South America -- finished up a gig last night in Brisbane, Australia ... then returned to his hotel in nearby Gold Coast, and went on a graffiti rampage ... covering an outdoor wall with colorful monsters.

Queensland cops tell TMZ ... they're well aware of the illicit artwork .. but so far, no formal complaint has been made -- and the GC mayor says he's ordered a cleanup crew for the wall.

If anyone's gonna have sex with Babyface's ex-wife, the legendary music producer is glad it's Deion Sanders.

Kenny "Babyface" Edmonds -- who divorced ex-wife Tracey Edmonds in 2005 -- recently sat for an interview with Oprah, and explained how Tracey's new BF Deion approached him for a man-to-man talk to make sure they had no problems with each other.

Babyface says he was blown away by Deion's classy move to clear the air ... and is totally at peace with Tracey's new relationship. Check the clip.

Babyface has been catching some flack for the interview -- he said he wasn't "in love" with Tracey towards the end of their marriage. But he tells TMZ, his words are being twisted. Babyface says he never stopped loving Tracey ... their love just changed from love-love to friend-love.

Miley Cyrus turned 21 years old this weekend ... and she celebrated with booze, celebrities, strippers and a guest appearance from a Dr. Seuss character ... and TMZ has the footage.

Miley -- now legal to drink alcohol in the U.S. -- partied at Beacher's Madhouse at the Roosevelt Hotel in L.A. on Sunday night, after the American Music Awards.

We're told Miley rented out the entire theater for the special birthday/AMAs afterparty.

Kelly Osbourne was one of the guests -- and took a pic with Miley with party hats, birthday cupcakes and a bottle of champagne.

Unclear why The Lorax was there ... but he no longer has to speak for the trees that have no tongues ... Miley's got enough tongue for everyone.

3 of Willie Nelson's band members were hospitalized this morning after their tour bus crashed in Texas ... and the band's blaming it on an icy road.

The band's bus (Willie was in his own ride) crashed along I-30 around 3:30 when it hit a bridge pillar -- about 80 miles east of Dallas.

The most severe injury ... a broken hip. The other two guys walked away with bumps and bruises.

A rep for the band says the next four shows have been cancelled.

On the road again.

10:00 AM PST -- This is a photo of the gnarly damage.

The man who disappeared in the case that involves a Charlie Sheen sex tape has been found ... and law enforcement sources tell us, he told cops he was KIDNAPPED. And, we've learned the LAPD has launched a criminal investigation into the kidnapping allegations.

Darwin Vela was located at 2 PM PT today, after vanishing Tuesday as he took his dog for a walk in South L.A. We're told Vela flagged down someone on the street and that person called 911.

As we first reported ... Vela and another man, Ricardo Orozco, went to Sheen's reps a while back and said they had a Charlie Sheen sex tape and wanted to know how much the tape would be worth -- i.e., extortion.

Orozco was arrested for allegedly stealing computers owned by Nic Cage's baby mama and law enforcement sources say they believe one of the computers contained the sex tape. Orozco was arrested and charged with burglary.

Vela was scheduled to testify in Orozco's preliminary hearing Thursday but on Tuesday, he left his house to walk his Chocolate Lab and a short time later the dog came back with human blood on its leash and was freaked out.

We do not know if Vela was injured. One law enforcement source says there were injuries but we can't be more specific. Cops are about to interview him.

The President of Mexico just laid el smack down on Justin Bieber -- calling BS on the pop star after JB claimed the two had met before his concert this week, but Justin claims it was all an honest mistake.

The drama began when Bieber went to Twitter on Monday and wrote, "just met some amazing mexican beliebers and the presidente of mexico and his familia."

Problem is, he didn't meet El Commander in Chief Enrique Pena Nieto ... and Nieto's office went right back to Twitter to clear his name ... denying the meeting ever took place.

Sources close to Justin tell TMZ ... it was an honest mistake ... because Justin was told that he had a meeting arranged with the "President's family."

When Bieber met the group, which was surrounded by security and arrived in an official-looking motorcade, he was under the impression he was meeting the numero uno family.

The 26-year old wrestler fainted in the ring Friday while wrestling Brie Bella in London, and dehydration was to blame.

According to reports AJ -- real name April Mendez -- was tended to at ringside after the scary fall ... and walked to the back on her own power.

We're told WWE medical staff continues to monitor her ... just to be on the safe side -- and also because she's really hot.

Chris Brown is out of rehab ... because he has something more pressing ... community service.

TMZ first reported ... Brown checked into a Malibu rehab facility for anger management 16 days ago ... after a street brawl in Washington D.C. in which he allegedly punched a guy in the face.

At the time ... we were told Brown could be in rehab for up to 3 months -- sources told us "The rehab facility has been told to take him [Brown] apart and put him back together."

Now ... a little more than two weeks after entering the program ... Brown has checked out.

Brown's lawyer, Mark Geragos, tells TMZ his client needed to get out of the facility to start the community service he's required to perform in the Rihanna case. As you may recall, the judge would not accept the hours Chris claimed he had done, and made him do it all over again.

Geragos would not say if rehab did the trick, but did tell us Chris will continue in outpatient therapy.

8:50 AM PT -- Sources close to Brooke tell us, Brooke is looking to move because she believes that's what the court wants. We're told Brooke is under the impression she can't live under the same roof as her children -- and when her brother Scott moves in today with the twins, she feels she's required to find another place to live full-time until her custody rights are fully restored.

Brooke Mueller seems to be subscribing to the adage, "Absence makes the heart grow fonder," because she's got her sights set on moving out of Charlie Sheen's neighborhood.

Brooke was shopping for condos in Bev Hills Monday ... just a day before twins Bob and Max will be living with her full-time, under the watchful eye of Brooke's brother Scott.

Here's what's interesting. Brooke has been living in a house Charlie bought just blocks from where he lives. Things have gotten so bad between the 2, Charlie has been making noises that she's becoming persona non grata, so condo shopping is not surprising.

As for who will end up paying for the condo ... it's likely good ol' Charlie will end up footing the bill. Brooke's child support was sliced in half after losing custody, but now that the kids will be living with her full-time, it's a safe bet Charlie will have to ante up $55k a month, just like in the good ol' days.