Paris Hilton's boyfriend lost his composure and aggressively pushed a female fan who got too close to the heiress in Cannes on Friday ... not once, but TWO TIMES, and it was all caught on tape.

The scene was utter mayhem -- Paris and River Viiperi were fighting through crowds of paparazzi to get into a party ... when one overzealous female fan got too close.

River -- clearly pissed off -- got physical with the woman and forcefully shoved her away ... but the lady kept coming back for more.

Paris finally snapped too and yelled at the woman to leave her alone -- but the woman didn't exactly comply.

Paris and River also went off on a security guard who tried to get handsy with Paris.
 
Don't worry, the couple eventually made it to the party ... and balance was restored to the universe. 

Good news for fans of hot girls making out with each other -- Rihanna says she's totally down to suck face with Miley Cyrus ... just as soon as Miley calls her up.

So, WHY is Rihanna talking about girl-on-girl action with Miley, you ask??

Long story short -- someone asked Miley the same question (in reverse) recently and M.C. said she'd "definitely" makeout with RiRi.

So, we found Rihanna this weekend on her way out of Georgio Baldi and asked if the hypothetical feelings were mutual.

... and they are! 

Now, we just gotta get the two of 'em in the same room ... with some Barry White ... and a camera.

Lindsey Vonn might be in it with Tiger Woods for the long haul ... because she was spotted this morning taking his kids to school ... with no sign of Tiger.

The two awkwardly announced their relationship via Facebook back in March, saying they have "been friends for some time, but over the last few months we have become very close and are now dating."

That means their relationship is somewhere around the 5 or 6 month mark.

So, we gotta ask ...

With a ratty blonde mohawk weave, enough drag makeup to make any 4 AM Hollywood Blvd. streetwalker jealous and some sort of loud Hawaiian print blazer, Dennis Rodman hit up "The All-Star Celebrity Apprentice" finale in New York City on Sunday ...  looking like the bastard love child of Rupaul and Tina Turner in "Mad Max Beyond Thunderdome."

The 52-year-old former NBA star turned clown finally managed to do something worse than vacation with North Korean dictator Kim Jong Un.

He is the United States embarrassador.

The Game was thiiiiiiiis close to jumping into a huge fight in Hollywood this weekend -- even taking off his shirt in preparation for battle -- but something crazy happened ... his entourage held him back!

Game had been partying at Lure Nightclub on Saturday night with some of his friends -- but moments after he talked to TMZ about the Eazy-E hologram, a fight broke out across the street ... and suddenly, it was mayhem in the streets.

It's unclear why or how Game was involved -- but he was definitely PISSED ... and clearly wanted to go beat someone's ass.

That's when his entourage stepped in -- one guy grabbed Game and physically restrained him ... while some other guys readied the rapper's car so they could get out of the situation before something bad happened.

Game eventually left the scene ... right as cops began to arrive.

Props to the entourage -- you guys are earning those Rolexes.

Chad Johnson was just arrested in Florida -- after a smoking hot Broward County judge determined the ex-NFL star violated his probation stemming from his 2012 domestic violence bust ... TMZ has learned.

We broke the story ... a warrant had been issued for Johnson's arrest earlier this month after he failed to report to his probation officer on 2 occasions AND failed to show proof of enrollment in a domestic violence education class.

Johnson's probation stemmed from his domestic violence conviction involving ex-wife Evelyn Lozada last year.

35-year-old Johnson appeared in a Broward County courtroom over his alleged probation violation -- and moments ago, the judge determined Chad WAS in violation and ordered him to be arrested and jailed.


Chad tried to tell the judge how the entire situation was a big misunderstanding -- but she wasn't having it ... watch the video.

TMZ has obtained Johnson's booking sheet -- he's listed as 6'4" 190 pounds.

Bond has been set at $1,000.

Dwyane Wade and LeBron James really are gunning for the NBA playoffs.

The massive Miami Heat superstars took time out from practicing for this week's playoffs to show off their rock hard buff shirtless pecs, arms and abs on the beach in Miami this weekend.

Unfortunately, the A-list ballers will have to put on jerseys to battle the Indiana Pacers in Game 1 of the Eastern Conference finals on Wednesday.

It should be a good game ... as long as Dwyane keeps those awful manpris at home.

Miguel was TRYING to jump from the stage to a platform ... but he missed ... and instead, a fan got ROCKED with a BRUTAL (yet accidental) LEG DROP TO THE FACE!!!!!

It all went down during M's performance at the Billboard Music Awards last night when the singer was performing his hit, "Adorn" ... which, minus the face-bashing, was pretty damn good.

After the performance, Miguel met with the fan backstage and tweeted about the leg drop --  "Got caught up in the moment, thank goodness Khyati is okay."

Meantime, here's what a REAL leg drop looks like ...

Justin Bieber was straight up BOOED at the Billboard Music Awards last night ... and not like 1 or 2 people ... it was a straight up CHORUS of boos ... and it made Justin super uncomfortable.

It all went down when Cee Lo called on Bieber to receive the first ever Milestone Award -- but when Bieb got to the stage, the crowd turned on him.

Of course, there were some screams from the hardcore Bieber fans ... and JB managed to silence the haters for a minute by thanking Jesus Christ (who's gonna boo JC?) ... but overall, more boos than a haunted house.

As for the Bieber/Selena Gomez situation, the two were NOT seated together during the show -- despite a pre-show photo of the seating arrangement that suggested they would be.

Instead, she was kickin' it with Taylor Swift ... and didn't stand when Bieber's name was called for the Top Male Artist Award.

Mary J. Blige's financial woes have QUADRUPLED -- on top of the $900k she allegedly owes the Garden State, TMZ has learned MJB has been slapped with a $3.4 MILLION bill from Uncle Sam.

The IRS filed a federal tax lien against the Grammy winner, claiming she failed to pay all her income taxes for the years 2009 ($574,907.30), 2010 ($2,203,743.53) and 2011 ($647,604.60).

Tax bill grand total: $3,426,255.43. Translation: A LOT OF FREAKING MONEY.

Of course, the IRS needs to get in line ... the State of NJ says MJB still owes $901,769.65 in back taxes. Blige is being sued for allegedly defaulting on a $2.2 million bank loan and her charity is facing a lawsuit that claims it took out a $250k loan and never paid it back.

We reached out to Mary's team for comment -- so far nada. We also alerted them to TurboTax.

Kordell Stewart REAALLLY doesn't wanna see his estranged wife Porsha Williams anymore ... 'cause the ex-NFL star just changed the locks on the family home to keep her out ... this according to Porsha.

The "Real Housewives of ATL" star just filed new docs in her divorce war with Kordell ... and it appears the nasty split just got even NASTIER.

According to the docs, filed in family court in Georgia and obtained by TMZ, Porsha claims Kordell has locked her out of their residence on multiple occasions ... and she had to have her lawyer beg Kordell's people for a key.

Sources close to the situation tell us Kordell isn't playing ball -- and hasn't forked over a key.

But there's more ... according to the docs, Porsha tried to work things out with Kordell in a mediation session, but she claims he blew the whole thing off ... and called it a "waste of everyone's time."

Porsha wants a judge to force Kordell to either allow her to use the house ... or pay her enough cash so she can get a "suitable alternative residence."

Sources tell us Porsha is currently living with her mom in ATL -- guess she feels it's just not a "suitable residence" for a grown woman.

Calls to Kordell's people have not been returned.

Mischa Barton came face-to-face with several police officers on Thursday ... when a fleet of squad cars rushed to her L.A. home in response to a report of a screaming woman on the actress' property, TMZ has learned.

Law enforcement sources tell us, the 911 call reporting the screamer listed Mischa's address as the location of the disturbance ... so multiple cop cars raced to the scene.

We're told cops knocked on Mischa's door and the actress answered -- but there was no screaming woman to be seen (or heard).

According to sources, police determined they were given the wrong address ... and later found the woman in question further down the block.

We're told Mischa's dad was also home when cops showed up -- and he was PISSED, believing Mischa was the victim of some kind of "swatting" prank.

Nope.