Troy Polamalu I'm Not Cutting ALL My Hair ... Are You Nuts?

Badass NFL safety and hair god Troy Polamalu will NOT go full Samson for an upcoming charity event, and his biggest sponsor couldn't be happier ... TMZ has learned.

Stories have been circulating the Pittsburgh Steelers star had agreed to cut his legendary locks for something called the "Veterans of Foreign Wars Mane Event" on Veterans Day.

The reports were misleading (perhaps intentionally) ... giving people the impression Troy was cutting ALL of his hair, but that's not true.

A rep for Head & Shoulders -- which has a long-term endorsement deal with Polamalu, and even insured his mane for $1 million -- tells us the haircut will be more ceremonial than anything.

We're told Troy will only chop a few locks as a symbol of support for veterans, and H&S fully backs him taking a little off the top ... metaphorically.

Makes sense ... Troy's hair is not only a money maker, it's his trademark. Cutting it off would be like Carrot Top going blonde, or Jonah Hill losing weight.

Then again, the Steelers are 0-3 this season.

Big Time Rush We're Getting Yoko'd!

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The biggest danger for a boy band ... girls.

Big Time Rush bandmates Kendall and Logan insisted on camera (above) their group is not breaking up ... but sources familiar with the situation tell TMZ ... the band is getting Yoko'd.

Here's what's happening. Carlos just got engaged, and his fiancee is demanding that he spend more time with her -- away from the group. She feels he's not pulling his weight in the wedding-planning department, and Carlos is feeling the pressure.

James has been dating a chick who is making similar time demands. We're told they're in a "committed relationship" and she feels he's been MIA way too much.

Short story ... Kendall (who's also in the band, Heffron Drive) and Logan are trying to put a good face on things, but there's Big Time trouble.

Fun Fact -- Yoko Ono was unfairly blamed for the breakup of the Beatles. If you're under 40, Google it.

Ariana Grande & Nathan Sykes Yes, We're Dating ... Sorry Justin Bieber

Almost is never enough for Ariana Grande and The Wanted singer Nathan Sykes ... so they're going all the way ... sources tell TMZ, the two are OFFICIALLY dating.

Ariana and Nathan have been canoodling for weeks -- and even filmed a steamy music video together for their song "Almost Is Never Enough" -- but according to sources close to the couple, they've now officially DTR'd.

This means Justin Bieber -- who was rumored to be hooking up with Ariana -- is completely out of the picture.

Congratulations ... on more counts than one.

Jim Carrey Dumb and Dumbness ... This is Really Happening!!!

Yes, we're saying there's a chance -- in fact, more than a chance ... Jim Carrey just gave the world hardcore proof the "Dumb and Dumber" sequel is really, finally filming.

Jim posted a WhoSay pic of himself and Jeff Daniels -- aka Lloyd Christmas and Harry Dunne -- attempting to read Jim's new children's book called, "How Roland Rolls."

It looks like they're standing in between their trailers on the movie set ... which is a good sign cameras are already rolling on the long-anticipated (almost 20 years now) "Dumb and Dumber To."

Then again, they could just be lost in a trailer park. Either way ... awesome.

Khloe Kardashian Hits the Clubs

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Khloe Kardashian went clubbing last night ... and a security guard went clubbing too ... clubbing photogs.

Sources inside Tru nightclub in Hollywood tell TMZ ... Khloe was hanging out with The Game and a few of his friends. We're told she did not drink alcohol the entire evening.

Khloe left the club at around 2:30 AM, and as she beat a hasty retreat a security guard went a little nutzo on our camera guy ... pushing him to the ground.

Even though Khloe hit the clubs -- sans Lamar -- sources connected to K.K. tell us she has not given up on her marriage. She's trying to figure out how to convince Lamar to seek help ... something he's been unwilling to do. BTW ... she was wearing her wedding ring.

As for Lamar -- we're told his drug problem is worse than ever.

Scott Disick And the Lord Said ... Let Me Be a Rapper

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Scott Disick -- last seen using Benjies as TP --- may have employment plans sans the Kardashians ... 'cause his buddy Tyga says the lord's gonna be a rapper!

The guys were waiting for Lord Disick's Lambo (naturally) outside Hakkasan in Bev Hills last night ... when Tyga dropped the bomb, "Scott's coming out with a new rap album."

Tyga even claimed he's producing the tracks -- but doesn't say much more about the alleged project.

Check the clip, Tyga might be kidding -- but if not ... Scott's got plenty of cred.

We already know he makes it rain ... in the bathroom.

Charlie Sheen Story He Partied With Zac TOTAL BS

Charlie Sheen says the media outlet that's reporting he had Zac Efron over for drug-fueled parties is totally making it up.

Sheen tells TMZ ... he hasn't even seen Zac for nearly a year ... specifically when Efron showed up to the set of "Anger Management" 11 months ago. Charlie says he showed up not to see him ... Zac was there because they share the same publicist who happened to be on the set.

The report claims Zac visited the set at least a dozen times. Charlie says it's all made up ... Zac was there that one time only.

As for the claim Zac spent a lot of time partying at Charlie's house and then strongly insinuating they were on cocaine binges ... Charlie says, "ridiculous." Sheen says Zac was at his home a grand total of one time -- nearly 2 years ago for a Super Bowl party. The next time Charlie saw Zac was when he visited the set 11 months ago.

Charlie is also angry the report claims he's on an uncontrollable cocaine binge. He says, "Consider the fact that I have completed 54 episodes of 'Anger Management' in a little more than a year ... something that would ordinarily take more than 3 years to accomplish."

Charlie calls the news outlet "adrift and unsalvageable."

Andy Cohen Alleged Fiancé is Straight But If He Wasn't ...

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'Real Housewives' creator Andy Cohen wants to make it absolutely clear -- he is NOT engaged to ex-hockey star Sean Avery, and he's just a really good friend.

A really good friend ... with whom he takes lots of shirtless pics, and would love to bang.

'Person of Interest' SHUT DOWN For Phony Gun Battle

NYPD dropped the hammer on the CBS drama "Person of Interest" today -- shutting down filming of the show after locals called cops thinking a scripted gun battle was the real deal ... TMZ has learned.

According to witnesses ... some NYC residents saw people with guns near 47th Street and 5th Avenue today, and believed they were about to get caught in a shootout.

We're told officers (real ones) responded ... and discovered the action was all part of the TV crime drama -- and the firearms were just props, but producers were still guilty of a major no-no.

All gun scenes are supposed to be filmed with NYPD supervisors on the set -- and since this wasn't, cops shut down all outdoor production.

The Mayor's Office confirmed the show's permit was revoked -- which forced producers to immediately stop shooting outside for the day.

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Sources connected to the production company tell us the whole mess was a "scheduling error" -- they started shooting earlier than planned ... before NYPD monitors arrived. We're told no shots were fired.

Also, the incident didn't affect indoor scenes ... which continued uninterrupted. We're told filming will resume again ASAP.

Kelly Osbourne Sues Landlord I'm NOT A Pig!

Kelly Osbourne is suing her former landlord, and it's not just for a lot of money. She's also defending her honor that she's not a filthy slob.

In the lawsuit, obtained by TMZ ... Kelly says she rented a fancy apartment in West Hollywood, which has been home to many a celeb, including Lindsay Lohan, Adam Lambert and Brody Jenner.

Kelly plunked down $18,700 as a security deposit before moving in. When she moved out, she claims the landlord never bothered to stop by to check out the unit, but shortly thereafter Kelly got bad news -- the landlord sent her an email notifying her of an estimate of damages. According to the landlord, the damage and cleaning expenses ate up her entire deposit so Kelly was informed she'd be getting zilch.

Kelly is suing for her deposit back, and under California law if the landlord wrongly retained the deposit she gets up to twice the amount. She also apparently thinks the landlord is an a-hole, because she wants punitive damages to teach the landlord a lesson.

Andy Cohen I'm NOT Banging NHL Star Sean Avery ... But I'd Like To!

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Andy Cohen is setting the record straight about the rumors he's gay-sexin' with his friend, NHL star Sean Avery ... telling TMZ it just ain't happening, but he wishes it was.

Cohen was leaving Highline Stages in NYC last night -- when we asked about the reports that he's engaged to the guy who used to date Elisha Cuthbert.

But Cohen blew off the allegations -- explaining, "Sean Avery is STRAIGHT. Do you understand that? So a gay guy and a straight guy should be able to be friends."

He continued, "Listen, I'd be happy if Sean and I were bangin' ... but it's not [happening]."

Britney Spears She Barfs (Very Possibly) During Desert Storm Concert Reveal

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Britney Spears got off to a shaky start for her Las Vegas debut -- she got sick on the chopper ride for her big announcement.

Britney didn't say if "sick" meant hurled ... but it's a reasonable conclusion. She wore gigantic sunglasses in the dark night as "GMA's" Sam Champion tried to get her animated.

So here's the lowdown ... Brit opens Dec 27 at Planet Hollywood. TMZ broke the story ... she'll be pulling in nearly $15 mil for 48 concerts a year and it's a 2-year deal.

Ticket prices are pretty reasonable -- $59 - $179.

Now this is interesting ... Champion asked her about possibly living in Vegas and Brit was sketchy. Our sources (and obviously they're good) tell us ... Brit will "absolutely not" be living in Vegas. She has no plans to get a house there. "It's strictly in and out," said one source involved in the concert ... partly because she doesn't want to disrupt the kids during their school year.

We're told Planet Hollywood will make a gigantic suite available on the 52 floor. There are several of these mega-suites available on the 51 and 52 floors ... People at the hotel call it the 5152, which is interesting. Brit knows something about that ... minus 2.

BTW ... Brit left in an Escalade. We're assuming the ride was barf-free.

Britney Spears Big Concert Announcement Desert, Helicopter, 567 Red Bulls

Britney Spears will spill the beans about her upcoming Vegas spectacular tomorrow, TMZ has learned -- and the announcement itself will be an extravaganza in the middle of nowhere.

We're told Britney will unveil plans for her big new Planet Hollywood show from an undisclosed location in the Mojave desert at around 4AM PT, and it will be broadcast live on "GMA."

It's going to be huge -- 1,350 participants will be bused from Vegas to the desert. And get this ... all attendees must be between 5' and 6' tall ... we don't know why.

As for Brit ... she'll be arriving via helicopter.

All told, we've learned the show announcing the show will cost roughly $100,000 -- including $27,176 to bus all the people (28 buses total), $4,200 for tents, and $5,154 for craft services ... which includes 2,100 bottles of water, coffee, 918 Gatorades, and 567 Red Bulls.

We're told Britney will be performing her new single "Work Bitch," and she'll then blast specifics about her new show that debuts in December. In case you can't wait, we have a bunch of particulars, including what she'll be raking in.

4 AM, huh. Bets on lip-synching anyone?

Liam Hemsworth REBOUNDING IN VEGAS Major Flirting With Hot Chick

Call him Dennis Rodman, 'cause Liam Hemsworth was rebounding like a CHAMP in Vegas last night ... spittin' some serious game to a smokin' hot chick -- and from the looks of things, it worked.

Just one day before reps "officially" announced the demise of his engagement to Miley Cyrus, Liam and 5 of his friends hit up XS Nightclub ... where he ran into 23-year-old Eiza González.

FYI -- Eiza happens to be a singer/actress (seems like someone's got a type).

They drank ... he smoked ... they flirted ... they were thisclose ... and people in the club said they never left each other's side before leaving the joint together at 2 am.

Muy bien.

Miley and Liam OVERT SIGNS OF SPLIT

It's one thing not to be seen together, but when you unfollow someone on Twitter it's pretty clear ... Miley Cyrus and Liam Hemsworth are dunzo.

Miley 86'd Liam from the social media site yesterday. He's still following her, but it takes 2 to follow in a fiance sort of way.

Miley and Liam have barely been seen together in the last few months, and when they were they looked like they were in pain.

Was Liam pissed at Miley's twerking video? Was he upset with what she was wearing at the VMAs? Was he infuriated at what she did to Robin Thicke?

So much to be pissed over.

1:40 PM PT -- Adding more fuel to the fire ... Liam was spotted out last night in Vegas at the Mayweather fight sitting near "Twilight" star Ashley Greene.

Khloe Kardashian Cracked After Lamar OD Rumors Spread

Khloe Kardashian still has deep feelings for the man she threw out of their house, because TMZ has learned she was terrified after hearing rumors Lamar Odom may have OD'd on crack.

Rumors were circulating late last week that Lamar had OD'd and was dying ... not all that unbelievable considering his drug addiction ... and when Khloe heard about it she freaked.

We're told Khloe "panicked" and began power dialing Lamar's cell phone, but it kept going to voicemail. She then started calling his friends -- a bunch of them -- trying to figure out if the rumor was true.

She finally got Lamar on the phone. He was at their downtown loft and said he was fine and the rumor was false.

We're told at that point Khloe pulled back and reiterated -- Lamar could not come back home unless he got treatment for his drug addiction. The call ended shortly thereafter.

So it seems she still loves the guy ... but had clearly drawn a line in the sand.