Chris Brown Don't Tell ANYONE I Was at Rihanna's Birthday

Chris Brown was so paranoid about keeping his attendance at Rihanna's birthday party a big fat secret -- he actually tried to FORCE partygoers to sign confidentiality agreements ... TMZ has learned.

Sources tell us, Chris refused to enter the private party Monday night at the famous Hearst Mansion in Beverly Hills until everyone signed an NDA -- sending his henchmen in beforehand to gather every partygoer's signature.

We're told although they didn't get EVERYONE to sign -- Chris eventually walked in ... and spent a huge chunk of the night nuzzling up against Rihanna.

According to sources, the two got real intimate -- sitting next to each other, talking, and holding hands ... all perfectly legal ever since the restraining order was lifted.

As for the rest of the party -- we're told it was jam-packed with celebs including Katy Perry, Bruno Mars, and Chris Martin (no Gwyneth).

Rihanna's cake was pretty badass too -- a giant spliff ... with a small Rihanna made out of icing, riding it like a horse.

Eat your heart out, Miley.

Chris' rep tells TMZ, confidentiality agreements were distributed only to workers at the party and anyone who was caught videotaping/snapping a pic of CB.

Asking people to sign confidentiality agreements AFTER they've already taken pics -- priceless.

Reggie Bush I'm NOT Back with Kim Kardashian

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Reggie Bush ain't going back to the Kardashian well ... telling TMZ he's 100% NOT dating his old flame Kim ... despite an expensive lunch date this weekend.

Reggie was hanging out on Rodeo Drive in Bev Hills when we asked if he was back on with his reality ex. Reggie couldn't have been more clear -- hell no.

TMZ broke the story ... Reg and Kim were spotted on a lunch date at the Beverly Hills Hotel this weekend.

Sometimes a really expensive salad is just a really expensive salad ... but sometimes it's not.

Lil Wayne Slipped Girlfriend MASSIVE Ring In Valentine's Day Surprise

Lil Wayne pulled off the ultimate romantic gesture last night at a swanky Miami restaurant -- slipping his girlfriend a FAT ring hidden inside a dessert ... and then shouting to the restaurant, "SHE SAID YES!"

Sources at Barton G restaurant tell TMZ, Weezy secretly handed wait staff a ring with a giant yellow rock on it during his meal -- and asked them to slip it inside the restaurant's signature sundae.

Moments later, after the dessert was delivered to his table, we're told Lil Wayne jumped up and shouted to the entire restaurant -- "SHE SAID YES!!!"

Sources tell us, everyone inside the restaurant believed the rapper had just popped the question. Weezy even tweeted later in the night ... saying again, "She said yes!" ... prompting millions more to think he had just gotten engaged.

But Wayne later clarified, "I meant 'she said yes' to being my valentine!!! Hahahahahahaha! Y'all krazy!" Yes, we're the crazy ones.

FYI, the dessert -- called the Sabrina Sundae -- costs $43 and comes with TWELVE scoops of homemade ice cream, complete with sparklers and crazy toppings.

As for the meal itself -- we're told the couple split the fried chicken and skirt steak.

It all seems a little weird to us -- so we gotta ask ...

Kate Upton I'm Definitely Maybe Dating Mark Sanchez

New York Jets interception-machine Mark Sanchez might actually have done something right this year ... and her name's Kate Upton -- this according to the super model herself.

Rumors have been spreading like wildfire ... Mark and Kate are an item -- but we asked the buxom Victoria's Secret angel straight up ... are you single ... and she played coy, replying, "What do you think?"

We pressed a little more ... asking if Mark was the mystery man -- Kate hedged, responding, "I don't know!"

As for the real truth -- Kate tells us, "It's whatever you think!"

So here's what we think -- if Mark had any game, he would have AT LEAST made the playoffs.

Kim K and Reggie Bush TOGETHER in Beverly Hills

Kim Kardashian has REUNITED with her ex-boyfriend Reggie Bush ... breaking bread with the NFL player at the Beverly Hills Hotel this weekend ... TMZ has learned.

Multiple sources tell us ... the two were smiling and laughing during the lunch date ... and played it cool when fans approached them for pictures and autographs.

We're told it seemed just like old times ... before Kim went off and married/divorced that other guy whose name we can't remember.

Sources say the two have been spending A LOT of time together in the past few days ... but it's unclear if it's a full-on reconciliation.

Angelina from 'Jersey Shore' I'm Not DATING Ahmad Bradshaw ... But We're REALLY Close

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NY Giants star running back Ahmad Bradshaw has apparently developed an extra-special relationship with former "Jersey Shore" star Angelina Pivarnick ... TMZ has learned ... but the Staten Island Dump insists they're NOT officially dating.

Angelina was at Saddle Ranch in L.A. yesterday ... when we asked point blank if they were together ... and we were met with an uncomfortable silence ... followed by, "I'm not dating him ... like, no."

Pivarnick explained, "We've hung out together ... we're really close, he's a cool dude."

"I think he's a hot black ... I'm not gonna deny that. I would be lying if I told you he wasn't hot."

Angelina recently posted a photo of the two lookin' all cozy at a NY club a few weeks ago -- they look platonic to you?

We called Bradshaw's agent for comment ... so far, no response.

So, we gotta ask ...

Demi Moore NOT Rehabbing at Cirque Lodge

There have been multiple reports by various outlets Demi Moore is getting treatment at the famous Cirque Lodge in Orem, Utah.

TMZ has confirmed with multiple sources familiar with the situation that Demi Moore is not at Cirque Lodge.

Moore has not been seen out in public ever since her whip-it induced medical emergency on January 23.

As TMZ previously reported, Moore had been partying with her daughter Rumer in Los Angeles ... and had to be hospitalized. Her rep later said she was being treated for stress and exhaustion.

Kim Kardashian I Will NEVER Date Another Football Player

Kim Kardashian isn't secretly dating Mark Sanchez ... she's not interested in Tim Tebow -- in fact, sources tell TMZ, the reality star is completely DONE with football players in general ... all thanks to Reggie Bush.

In case you haven't heard -- there were reports Kim and Mark were seeing each other on the DL whenever she was in New York. There were other rumors Kim came on to Tim Tebow because of his old-fashioned values. But we're told ... it's all BS.

Sources close to Kim tell us, her break-up with Bush in 2010 was so rough ... she has lost her taste for NFL players entirely -- and has no plans to play the field in the near future.

Now that she's moved on from NBA players too ... she's only left with baseball, hockey, soccer and golf. Hey, Tiger's available!

Kris Humphries Single, But Not Ready to Mingle

Although rumors of his dating escapades have swirled since he split from Kim Kardashian, sources close to Kris Humphries tell TMZ ... he has no plans to date anytime soon.

According to our sources, Kris has not dated anyone since his breakup from KK. We're told Kris has not gone out on a single date and right now his only focus ... is on basketball.

And it's working so far -- Kris is averaging career highs in points, rebounds, assists, blocks and steals.

See? Breaking up with Kim K isn't all bad!

Whitney Houston and Ray J Back Together?

Whitney Houston and Ray J sure seemed very couple-y outside a restaurant in West Hollywood last night -- because when it came time leave, Ray J was the PERFECT gentleman.

As the two were leaving Le Petit Four on Sunset Blvd last night, Ray J opened the door for Whitney, made sure she was safely snuggled inside, and then shut the door for her. Chivarly ain't dead!

The two have on-again/off-again for several years. They were last rumored to be together back in 2010.

Eddie Murphy I Ain't Dead ... Yet

The Internet is blowing up with reports that Eddie Murphy is dead. NOT TRUE.

We made some calls, and Eddie is very much alive.

The frenzy was triggered by MediaFetcher.com. The site has been spinning bogus stories about other celebs they claim are dead but are not -- including Jon Bon Jovi, Charlie Sheen, Adam Sandler, TooShort, Dwayne Johnson, Kevin Bacon, Luke Perry, Jack Black, Will Smith, Jaden Smith, Tom Green, Mac Miller, Tiger Woods, George Clooney, and others.

Pavlov's dog could have figured this out quicker.

Lindsay Lohan Calls BS on Boozing Story -- Threatens to Sue

Lindsay Lohan says there's NO TRUTH to reports she was boozing at a SAG Awards after party this weekend ... and now, TMZ has learned, she's threatening to SUE the media outlets that published the story in the first place.

A source close to the actress tells TMZ ... Lindsay is already exploring her legal options with her attorneys ... because she feels the false stories are sabotaging her effort to save her career.

Lindsay acknowledges she WAS at the party at the Chateau Marmot hotel in Hollywood Sunday night ... but insists she was sitting with Alan Cumming the whole time and ONLY drank water.

We're told Lindsay's also pissed over reports about a recent gas station makeout session with Dennis Hopper's son Henry (pictured above), where she allegedly purchased Red Bull and vodka.

Sources close to LiLo tell us the actress is adamant the two are just friends ... NEVER MADE OUT ... and the only items she bought were soda, chips, and cigarettes.

Golfer Phil Mickelson I Have No Bastard Son!

Golf pro Phil Mickelson says he has NOT been sinking his putts where it doesn’t belong … and now he’s sicking his lawyers on the people who’ve plastered the Internet with accusations he fathered an illegitimate child.

Mickelson was pissed when he learned some jerkwad or jerkwads using the screen names “Fogroller” and “Longitude” had been posting scurrilous claims about him and his wife on a message board … which implied the Mickelsons are BOTH screwing around on each other Tiger Woods-style.

Phil claims he was able to track the I.P. address to an Internet service provider in Quebec. And now, he wants a Canadian judge to force the ISP to hand over any information which could identify the mystery poster – so Phil can tee up a defamation suit against the offender.

In the docs, the San Diego golf champ claims the allegations are vicious and absolutely untrue -- and worries the claims could damage his “impeccable reputation.”

Snooki I'm NOT Pregnant And Stop Calling Me Fat!

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Snooki is calling radishes on a report that she's pregnant -- claiming not only is she NOT pregnant, she's insulted by the insinuation she's fat.

The "Jersey Shore" star left Sirius XM studios in New York moments ago -- where she appeared on the Opie & Anthony radio show -- and a photog flat-out asked if the pregnancy rumor was true ... Snooki firmly replied, "NO!"

Worse, Snooki's livid at rumors she's gained weight, claiming, "Why are people calling me fat? That's so rude!" Snooki said she does wanna get pregnant one day though ... when she gets married.

As for the Opie & Anthony interview (below) -- Snooki said the media outlet that reported the story is just like one of the bullies who terrorized her in high school ... and she has a message for the offender ... "I hate you."

Snooki -- I'm NOT Pregnant And Stop Calling Me Fat :: 0201-snooki-audio-launch

Check out the vid for Snooki's Super Bowl favorite. You won't believe it.

Steve-O & Elisabetta Canalis Video PROOF They're Dating ... Probably

Elisabetta Canalis and Steve-O went to a HAIR SALON this weekend ... TOGETHER ... so, it's fair to assume they're totally dating now, right?

Rumors have been swirling for weeks ... that George Clooney's ex-GF and the "Jackass" star have been getting pretty up close and personal in the past few weeks.

The two hit up Trust Hair Salon in West Hollywood on Saturday ... and as they both got into Steve-O's car ... we asked if they were officially more than friends.

They didn't have to say anything ... it's pretty obvious.

Gerard Butler 'Who's Brandi Glanville?'

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If Gerard Butler really did have mind-blowing sex with "Real Housewives of Beverly Hills" star Brandi Glanville -- as she proudly claims -- he doesn't remember it ... asking TMZ, "Who's Brandi Glanville?"

In case you didn't know ... Brandi -- Eddie Cibrian's ex-wife -- recently appeared on a talk show, announcing she once bumped uglies with Gerard for an entire week ... and it was so good, she rated him an 11 out of 10.

But either Butler has so much good sex, he can't remember every bangmates's name -- or Brandi's lying. Both are equally plausible.