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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.

Lamar Odom has escaped to his Alma Mater – the University of Rhode Island – for the week ... and is hitting the courts at his old gym ... presumably training for his alleged return to the NBA.

Lamar told our camera guy over weekend he's been in talks with the LA Clippers ... after his career was derailed this summer by a serious crack problem.

The assistant coach at URI – Preston Murphy – was a former teammate of Lamar’s when they played college ball together back in ’98 … and it looks like Murphy is letting Lamar use the facilities to train while the team is away for the week.

Lamar has been mugging with students on campus.

Alec Baldwin's daughter says her dad was wrong for dropping an anti-gay slur this week on a camera guy in NYC ... but it still doesn't make the actor a homophobe.

Ireland Baldwin took to Twitter Saturday afternoon to speak out about the video we posted Thursday of Alec clearly calling a photog a "c**ksucking f*g" ... even though he claims to have said otherwise.

Ireland made her stance clear saying "my dad is far from a homophobe or racist" ... before putting the blame on paparazzi for getting in Alec's grill.

She adds, "Sometimes we let our tempers get the best of us. Tempers are like wildfires. Something or someone can easily fuel the fire."

Brand tweeted about the ban today saying his people thought things had been worked out with S.A. officials ... but when Russell landed, airport staff said he couldn't stay.

It's unclear why he's not allowed in South Africa ... but the "Get Him to the Greek" star claimed the same thing happened to him in Canada back in '11.

Maybe they had a problem with "African Child"??

Alec Baldwin is finally admitting (and even apologizing) for spewing a homophobic slur at a photog in NYC yesterday ... but shockingly, the slur he's copping to is NOT the F-bomb.

Late last night, Baldwin went to Twitter and wrote, "Rich Ferraro from @glaad informs me that c'sucker is an anti-gay epithet. In which case I apologize and will retire it from my vocabulary."

Of course, Baldwin's referring to the incident outside of his Manhattan apartment ... when he called a photog a "c**ksucking f*g."

Funny, Alec is ADAMANT the F-word he used was "fathead" and NOT "f*g" ... even though you can hear it clear as day in the footage, which we posted on TMZ.

A rep for GLAAD has also issued a statement ... saying, "Mr. Baldwin can’t lend his support for equality on paper, while degrading gay people in practice. It's clearly time he listens to the calls from so many LGBT people and allies to end this pattern of anti-gay slurs."

7:55 AM PT -- Anderson Cooper has also weighed in ... tweeting, "Wow, Alec Baldwin shows his true colors yet again. How is he going to lie and excuse his anti-gay slurs this time?"

Charlie Sheen just learned a cool lesson -- you can call a judge in your custody war an "anus brain" and get away with it, even with a gag order ... and that's exactly what just happened.

We've learned the judge in the DCFS case called all the lawyers in this afternoon for an emergency meeting. Sources connected with Brooke Mueller tell TMZ ... the judge wanted to have a chit chat about Charlie's latest Twitter rant and his appearances on TMZ Live.

You'll recall Charlie exploded on Twitter Friday, calling the folks at Child Services "lascivious and incompetent." Sheen then directed his ire at the judge, calling him "Mr. I'm Italian judge anus-brain."

And Charlie went on "TMZ Live" a couple weeks ago and blasted Brooke, calling her an evil whore who's endangering their children.

Our sources say the judge decided it would NOT be in anyone's best interest to hold a contempt hearing, for fear it would turn into a "circus." So we're told Charlie's lawyer promised his client would muzzle himself and be a good boy. And that was good enough for the judge.

Spike Lee was so blinded by rage over George Zimmerman's shooting of Trayvon Martin ... he tweeted the address of an elderly couple, believing it was Zimmerman's ... and they claim Spike put their lives in grave danger.

David and Elaine McClain claim in a new lawsuit Lee was so filled with hate he got the wrong address and carelessly threw it up online ... just days after the shooting.

In the lawsuit ... the McClains say they received numerous death threats and hate mail ... and feared for their lives as their address was re-Tweeted countless times.

The McClains say Lee's Tweet of their address encouraged "a dangerous mob mentality." Now they want a lot more for their troubles and grief.

Justin Bieber must have eaten some bad empanadas in Argentina ... 'cause the singer just revealed he's got food poisoning.

Biebs dropped the crappy news on Twitter Sunday evening, but quickly assured fans his sour gut would not result in any canceled concerts ... at all.

It's one more piece of bummer news for Justin whose current Central and South American tour has been plagued with issues -- like destructive fans, fake hookers, graffiti tickets and hotel problems.

Good thing Pepto-Bismol is global.

Charlie Sheen is a self-absorbed, psychologically screwed-up parent who is quick to blame others for the plight of his twins, but unwilling to step up to the plate ... so claims the L.A. County Dept. of Children and Family Services.

DCFS sources tell TMZ ... they're pissed that Charlie is hurling grenades at everyone involved in the mess that has become his family -- calling Brooke Mueller a "whore," the judge an "anus brain" and DCFS "incompetent and lascivious."

Our DCFS sources -- who work in the trenches -- say Charlie has NEVER made a real move to take custody of Bob and Max. As one source put it, "He cares more about his drugs and porn stars than he does the kids."

There seem to be 2 schools of thought at DCFS -- one is that Charlie is so psychologically screwed up and angry that he should never have the kids, and the other that he has never given the Dept. the chance to take a serious look at him as a custodial parent.

Either way ... DCFS -- not fans.

5:55 PST -- Charlie just tweeted this picture saying "a day of miracles on a field of dreams ... hashtag a real modern family."

Charlie Sheen's latest rant shockingly has not incited Brooke Mueller or the L.A. County Department of Children Services into running to court for a contempt citation ... but when Sheen comes face to face with "Judge Anus" it could be a whole different story.

Multiple sources involved in the case tell TMZ ... Charlie's Twitter rant Friday night -- in which he railed on Brooke, DCFS and the judge -- CLEARLY violates the gag order but they don't feel the need to have Charlie thrown in jail.

Our sources say Brooke's reasoning is that it's not her place to put Charlie in the pokey. As for DCFS ... they think it's simply evidence that Charlie is psychologically imbalanced.

The judge is a different story. As we first reported, hizzonor made it clear this week to Sheen ... if he opened his trap about the case one more time he's going to jail. Now that Charlie has called the judge "Mr. I'm Italian judge anus-brain" it seems almost certain Charlie has forced the judges hand.

Charlie Sheen just violated the gag order in his custody case in a spectacular way, calling the judge Mr. "I'm Italian judge anus-brain," and threatening him if his kids are hurt in the newest custody configuration.

It's something of an understatement to say Charlie is not pleased that the judge just made Brooke Mueller's brother Scott the temporary guardian of twins Bob and Max. The judge also allowed Scott and the kids to live with Brooke so they could be close to school. That effectively puts Brooke back in the position of having full custody while she tries to beat her latest drug abuse problem.

Charlie just tweeted, "So lemme see if I got this straight ... my twin boys are now in harm's way and in grave danger, being 'raised' by a gaggle of incompetent and lascivious marionettes all ruled and fooled by an Adderall snorting husk called Brooke."

Now it gets good ... "And guess what CPS and 'I'm Italian' judge anus-brain, you may have gagged me temporarily, but mark my unspoken words, anything happens to my boys, and you will get to know me, know who I truly am, a loving father."

He ends, "Tag -- I'm it."

The judge just hauled Charlie into court a few days ago, telling him he's going to jail if he violates the gag order again.

"Tropic Thunder" star Brandon T. Jackson was an obnoxious, drunken a-hole during a flight Monday ... and that's why he was booted from his plane, so says US Airways.

A rep for the airline tells TMZ ... crew members adamantly deny using the N-word during an inflight altercation with the actor, despite the actor's allegations.

As we previously reported, Brandon went on a Twitter rant last night -- claiming a flight attendant hurled racially-charged epithets at him for no reason ... but now, the airline is calling BS.

The rep explains, "The disruptive behavior started with loud music being played by Mr. Jackson at his seat. He was asked several times to turn down the music. Additional erratic behavior was observed and that is when the crew made the decision to stop serving [alcohol to Brandon]."

US Airways says it stands behind the crew -- claiming they handled the situation appropriately.

When Jackson's flight landed in Phoenix (where he was supposed to catch a connecting flight to Burbank) he was escorted off the plane and interviewed by Phoenix PD.

Cops determined no crime was committed and he was allowed to leave -- but US Airways banned him from getting on the plane to BUR.

Charlie Sheen is killing Brooke Mueller with kindness -- at least he really, really wants to -- because he just wished his ex-wife a happy birthday with a special piece of cake (topped with a grenade).

FYI, it's not actually Brooke's birthday (that's in August) but it didn't stop Charlie from writing this message on Twitter, "Happy Bday Brooke. When you're done sucking off the parking lot at Home Depot, why don't ya 'blow' out this candle?"

Now that's love.

Oh yeah, if you recognize the cake ... that's because it's the same cake Charlie got for his recent "Anger Management" party.

The Warlock has returned.

Charlie Sheen says his ex-wife Brooke Mueller is a dangerous, EVIL whore who's putting their twin boys in SERIOUS DANGER ... and now, Charlie says he's on a mission to stop her before it's too late.

Sheen just called TMZ and told us ... his 4-and-a-half year old twin boys Bob and Max have already suffered physical and emotional damage from the time they've spent in Brooke's care. In fact, he says they're very close to getting kicked out of school.

Charlie says the boys are deathly afraid of Brooke's house -- which is covered in pet lizards, various insects and other critters -- and they suffer night terrors after spending time at the home.

Charlie also says Bob suffered a bad rash on his face after recently spending time with Brooke -- a rash that "looked like somebody burned him."

Charlie says he's complained to L.A. Child Services -- but they refuse to help. Instead, Charlie claims, Brooke is getting MORE custody ... and he doesn't understand why.

Sheen ripped Child Services on a Twitter rant last night -- calling them "doosh bags" who have done nothing to protect his children. He also called Brooke an "evil and pathetic über loser" and a "whore."

Sheen says Brooke is supposed to get her first unsupervised overnight visit with the twins tonight -- and Charlie says he's very afraid of what could happen.

Charlie says he's not sure if Brooke is back on drugs, but he is sure about one thing -- "She's as awful a parent and a person as you can possibly draw up."

A gunman reportedly just opened fire inside a terminal at LAX -- and "MythBusters" stars Grant Imahara and Tory Belleci were in the danger zone.

The shooting reportedly occurred around 9:30 AM in Terminal 3. According to reports, a TSA agent was shot at a checkpoint. The suspect was reportedly shot by police and taken into custody.

So far, no reports of other victims.

People inside the terminal were evacuated onto the tarmac -- including Belleci and Imahara -- and Belleci tweeted a photo of the mayhem.

He writes, "Shooters in #LAX That was f***ing terrifying! ... Heard gun shots then everyone starting running for the door." Belleci says he and others now being shuttled away from the terminal.

Imahara tweeted, "I was in the Virgin lounge upstairs. Saw everyone pour out of the terminal onto the tarmac. Then I heard shots fired outside ... Virgin promptly locked the lounge doors. About ten minutes later, LAPD armed with automatic weapons arrived to secure the area."

We just spoke on the phone with Tory ... who described the chaos.

The 418-lb wrestler shaved his head last week ... and afterward, everyone said he looked like Rick Ross.

So of course ... he dressed up like Ricky Rozay for Halloween!

The real Rick Ross approved of the costume online afterward -- and gave the costume two thumbs up.

Boss.