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Charlie's lawyer Marty Singer calls the allegations "completely fabricated." He adds, "No bodyguard made the absurd statement to the dentist. Charlie had a bad reaction to the noxious gas put in his mouth and nose."

Charlie Sheen clearly doesn't like going to the dentist, because he's under investigation for assault with a deadly weapon for allegedly going nuts in a dental chair in a rock cocaine-fueled rage ... TMZ has learned.

Law enforcement sources tell us ... Charlie was at an L.A. dental office last Thursday for an abscess. He sat in the chair as the dental technician placed a mask over his face to administer nitrous oxide, when she says Charlie went insane ... flailing his arms and striking her.

The technician told cops she walked out of the room as Charlie's security guard entered. Charlie's personal dentist was there along with the oral surgeon. There was a lot of commotion and the technician says when Charlie's dentist finally came out he told her Charlie pulled a knife and went after him. The dentist wasn't hurt.

The technician also told cops the bodyguard told the dentist Charlie was high on rock cocaine.

We're told there's an active LAPD investigation and cops are looking at a possible battery against the technician and felony assault with a deadly weapon for the alleged knife attack on the dentist.

We're told cops want to interview Charlie and the dentist before sending the case over to the L.A. County D.A., who will decide whether to prosecute.

We reached out to Charlie ... so far, nothing back.

The Orlando Bloom/Justin Bieber/Miranda Kerr/Selena Gomez love square united in significant fashion during Paris Fashion Week and it was nothing but uncomfortable.

Miranda and Selena posed for this pic at the Louis Vuitton show and looked like they'd both rather be in a dentist's chair.

Their common bond is of course Justin Bieber, who is currently banging Selena and was famously and allegedly banging Miranda after a NY fashion show.

As TMZ reported ... earlier in the day Justin was at another show when Miranda suddenly appeared and Justin literally hid behind Kim Kardashian's butt.

Meanwhile ... back at the ranch in L.A. -- our photog got Orlando Bloom out, who famously took a swing at the Biebs in Ibiza, and asked about Justin possibly stepping out on Selena for Kendall Jenner.

So complicated.

Justin Bieber just left a big fashion party in Paris that was filled with celebs ... and we're told the Biebs made sure he didn't cross paths with the modern version of Helen of Troy -- Miranda Kerr!

Justin hit up the CR Fashion Book Party and mingled with Kim Kardashian, Kendall, Kris, Paris Hilton and Selena Gomez. Our spies say Justin was gushing about Selena, telling people how beautiful she is and how they're really tight now. So the whole champagne dinner with Kendall was innocent.

JLo and Leah Remini are MADD ... because they got rear ended by a drunk driver .. TMZ has learned.

Law enforcement sources tell us .. Leah, who was driving JLo's car with the singer and 2 kids, were riding along Pacific Coast Highway in Malibu when they stopped at a light. We're told a driver in a small pickup hit them from behind and then took off.

Either JLo or Leah called 911 ... describing the driver and the pickup. Deputies raced to the scene and found the driver a short distance away, determined he was driving under the influence and arrested him for DUI and hit and run.

No apparent injuries ... but whiplash pain is often delayed by a few days.

JLo posted this Saturday ... "Sitting at a light. Riding high right before some drunk fool rear ended us in my new whip!!! Thank god everyone ok."

Ariana Grande's brother is pretty sure she's not the horrible diva everyone's accusing her of being ... just give him a little while to remember.

Frankie Grande was out at Eleven Bar & Nightclub to celebrate the "Big Brother" finale when we hit him up for the scoop on his super popular sister ... who is being called out left and right lately for her allegedly being very difficult.

You'd think Frankie would've shot down that question immediately when it was posed to him -- but watch the video. What's with the delay tactics and pregnant pauses, bro?

With her "True Blood" hunk boyfriend Joe Manganiello nowhere in sight, Sofia Vergara hung out Wednesday afternoon in New York City with her former fiancé, Nick Loeb.

Loeb and Vergara called off their two-year engagement back in May. Vergara began dating Manganiello just two months later.

Sofia and Nick are reportedly still friends ... and that's it.

Ariana Grande is done letting her publicist speak for her -- stepping up to personally squash rumors about her alleged nude photo leak ... and says it ain't her.

Grande was one of the stars whose naked ass was allegedly exposed in the first round of leaked photos a few weeks back. But Monday at LAX ... she laid out a full list of reasons why the pics are definitely fake.

Jennifer Lopez performed at the Singapore Grand Prix and laid down the perfect sequel to her "Booty" music video.

There was so much ass shaking and grinding ... the performance should go down in the annals of history! Or at least of this week.

With her backside back in the headlines, 45-year-old Jennifer Lopez put her most prized asset front and center while performing Sunday night at the Singapore Grand Prix.

Jennifer Lopez looks so good in lube in her new "Booty" music video with Iggy Azalea -- she now stands to make a bundle off a company that makes the stuff.

Reps for Doc Johnson Lube fired off the sticky to proposal to J.Lo after seeing the video last week -- and we're told they were especially inspired by the shots of her covered in a liquid they believe to be personal lubricant.

Bottom line -- Doc Johnson wants to be in the J.Lo butt business ... and the company is offering her a year's worth of its lubrication gel for free to prove it. The good doc also wants to discuss a long term sponsorship deal, if Jennifer's interested.

Something tells us this is NOT right up her alley -- but can't knock 'em for trying.

Iggy Azalea is one big-ass contradiction ... she's running from a sex tape her former BF made, but she just dropped one of the hottest, most sexual videos EVER with Jennifer Lopez.

Just watch and behold the video -- "Booty." Whatever your sexual orientation, you will be turned on. Seriously.

Iggy and JLo grind crotches and slap each other's asses ... with commitment.

It's also very wet ... after they oil up. BTW ... there's also music, but seriously, who cares?

Los Angeles Lakers star Nick Young is a huge friend of his GF's ass ... and so is Jennifer Lopez ... 'cause J.Lo and Iggy Azalea are twerking ALL OVER EACH OTHER in a new video that just hit the 'net.

Lopez just released her new video for "Booty ft. Iggy Azalea" ... and really it's just an excuse for the two badonkalicious women to show off their backsides.

There's booty shakin ... booty slappin' ... booty twerkin ... booty on booty action.

It's insane.

Robin Thicke must feel like wherever he goes, trouble follows, because we found out he was stranded in Cabo with 30,000 other tourists and was treated like one of the crowd.

Robin was there with his son and nanny ... vacationing when Hurricane Odile hit and hit hard.

Robin was stuck for days trying to get out. We're told he left Tuesday with the help of a military aircraft. Angie Everhart was also stranded and took the same plane to Mexico City with a layover and then on to L.A. ... where they finally landed Wednesday.

Miley Cyrus could go to jail for getting her ass whipped on stage ... with a Mexican flag.

Miley was performing Tuesday night -- on Mexican Independence Day, mind you -- in Monterrey, Mexico when one of her dancers slapped her prosthetic butt with a Mexican flag.

Apparently Mexican officials are super sensitive about disrespecting national symbols so the congress of the state of Nuevo Leon wants her prosecuted. The crime of desecration carries a $1,200 fine and a 36 hour jail sentence.

It wouldn't be the first time a singer crossed the line South of the border. Paulina Rubio was fined $4K for appearing naked in a mag ... draped in a Mexican flag.

Will Miley's butt ever learn?

Ryan Gosling and Eva Mendes are now the proud parents of a baby girl -- which is damn near miraculous, considering they denied she was pregnant all along.

Eva popped out the little bambina on Friday ... according to US Weekly.

So far ... Ryan and Eva haven't revealed a name or any of the baby's vital stats -- which is not shocking. As recently as July they wouldn't cop to the pregnancy ... even after Eva was photographed clearly trying to cover her belly.

Little girl's got the most gorgeous parents on the planet -- c'mon ... we gotta see the baby.

Serena Williams took a well-deserved break after winning the U.S. Open, relaxing on a beach in Miami with Eva Longoria over the weekend.