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50 Cent has SERIOUSLY upgraded his personal security team ... 'cause one of the guys watching his back is UFC Hall of Famer (and ex-WWE superstar) Ken Shamrock!!!!

49-year-old Shamrock was spotted on the rapper's personal protection detail at the CES convection in Las Vegas yesterday ... and afterward, Ken confirmed he's now working for a company that does private security for several "high-end clients," including Fiddy.

After the convention, Ken tweeted that it was a "pleasure" working for 50 ... and said the rapper is, "By far one of the classiest gents I have ever worked with."

As for Ken's fighting career -- he may not have given up on the ring entirely ... just last month, he appeared in a wrestling event in Costa Rica.

But for now, don't screw with Mr. Cent ... or you might end up in a nasty ankle lock.

One of the contestants eliminated last night on "The Bachelor" is blaming producers -- telling TMZ, they told her to act like a dumb bimbo on the show ... and then broadcast her humiliating rejection.

Kylie Lewis tells us, producers told her to do 3 things that she now believes resulted in leaving the show roseless:

-- They told her to dye her hair from strawberry blonde to red

-- They advised her to wear a pink dress instead of purple

-- They had her tweet Juan Pablo immediately after they met for the first time ... making her look desperate

Kylie -- who's an artist -- says she had drawn a picture of Juan which she intended to give him to create a good first impression, but producers wanted a lame tweet instead, making her look like an immature ditz:

OMG I JUST MET @JuanPaGalavis!!!

— Kylie Lewis (@KLew55) September 18, 2013

If you missed it, Juan selected another bachelorette (Kat) to receive a rose, and Kylie thought she heard her name ... so she walked up to get the flower. When she realized it was a mistake, she was humiliated, and she's crushed producers chose to air it ... TRANSLATION: This chick is naive.

Rose McGowan says she personally witnessed a knockout game attack in L.A. yesterday ... when a masked "evil guy" punched an unsuspecting 65-year-old man and then took off.

McGowan described the incident on Twitter ... saying she was walking around Venice, CA when things got violent.

"I just witnessed a 65 year old man get punched by an evil guy playing that goddamn knockout game. #criminal #heartbroken #whattheF?!"

Rose says the attacker was wearing a mask and riding a skateboard ... and while she tried to chase after the bad guy, he was just too fast and got away.

McGowan said the victim was bleeding from the ear, so she called an ambulance for him.

Rose says the victim had a little dog with him at the time that tried to protect him, but couldn't fend off the attacker.

So far, no word on the identity of the attacker or the victim.

Justin Bieber and Selena Gomez have segued from separate to together ... at least for the afternoon.

Take a look at this pic. Our Calabasas spies tell us Justin and Selena were just spotted tooling around The Oaks -- where Justin lives -- on their Segways.

The two haven't been spotted together for months, and it seemed Selena was done with him.

Justin is clearly showing her who's boss ... leaving Selena in the dust at a mighty 12 MPH.

Britney Spears' dad learned a lesson in swag ... you gush over a product and the company that makes it will probably send you free stuff ... which brings us to duct tape.

During the "I Am Britney Jean" special Jamie Spears couldn't stop talking about his obsession with duct tape.

Now enter a company that manufactures "Duck" tape ... someone heard Jamie and the company sent him 1500 yards of the sticky stuff ... enough to span 15 football fields. Yeah, we know our sports.

The company sent various colors, including classic grey.

After the special, Britney tweeted bout her dad's infatuation saying she's gonna buy him a ton for Xmas.

Justin Bieber is NOT backing off his promise to "retire" after his album drops ... and last night, he proved he means business by reinforcing his retirement plans ON TWITTER!!!

Just one week after he initially announced his upcoming retirement while appearing on an L.A. radio station, Justin issued a Christmas Eve statement saying, "My beloved beliebers I'm officially retiring."

He added, "The media talks a lot about me. They make up a lot of lies and want me to fail but I'm never leaving you, being a belieber is a lifestyle."

And in a Jesus-esque final statement ... he concluded, "Be kind loving to each other, forgive each other as god forgave us through Christ Merry Christmas I'M HERE FOREVER."

Though Jesus never urinated in a mop bucket ...

ATTENTION RESIDENTS OF BEVERLY HILLS -- THERE IS A SWAN RUNNING LOOSE IN YOUR COMMUNITY ... and Lisa Vanderpump really, reallllly wants it back!!!

The "Real Housewives" star just took to Twitter to put out an APB on a baby bird that just went missing from her Bev Hills mansion.

"I know it's what some people may call 'a high class problem' however,1 of my baby swans took off yesterday."

"If anyone in Bh sees errant swan Please bring him back! He is only a few months old didn't think he could fly yet Bring him back ..!!"

She included a picture of her swans -- though it's unclear which one is MIA ... since they're frickin' swans and they look exactly the same.

It's not the first time Lisa's had to deal with a missing luxury item -- back in 2010, her Bentley was stolen from her driveway ... but Lisa was more concerned about the contents in the back.

"They can have the frickin' car, but can I have my dry cleaning in the trunk, please?"

The car was eventually recovered at the bottom of a cliff ... right near a car that had been stolen from Charlie Sheen's home.

Charlie Sheen just WENT OFF on "Duck Dynasty" star Phil Robertson -- threatening to unleash a monstrous media attack on the reality star ... unless he makes amends with gay people.

Sheen posted the long diatribe on Twitter ... and quickly put Phil on notice saying, "just when your desperately sub evolved ass thought the pressure was off, you are now in the crosshairs of a MaSheen style media beat down."

Charlie claims he's only voicing his opinion out of the blue for one reason ... to stick up for all his gay friends whose voices are not as powerful.

The letter is filled with classic Sheenism's -- like calling Phil a "shower-dodger", something about Charlie whittling his "cosmic banjo" ... and even a "news flash" for old times sake.

Steve Martin learned an important lesson about lasagna last night ... the dish can get racial.

The SNL alum was cracking grammar jokes on Twitter .. when someone asked, "is this how you spell lasonia?"

Steve's response ... "It depends. Are you in an African-American neighborhood or at an Italian restaurant."

Seconds later the 68-year old actor deleted the tweet and apologized. But the floodgates opened, the original tweet went viral and Martin atoned again: "I did apologize. But again, a second later I realized what an offensive thing I'd done ... In retrospect, bad joke."

A penne for his thoughts.

Denise Richards is the Grinch who stole Christmas ... at least according to Charlie Sheen -- who's pissed at his ex-wife for pulling the plug on his holiday plans with their daughters.

Sources close to Sheen tell TMZ Denise informed Charlie this weekend she didn't want him to join her, Sam, and Lola on their family Christmas trip -- and didn't really explain why.

We're told the news sent Charlie into a tailspin since he's already not seeing twins Bob and Max this year for Christmas -- they'll be with temp guardian/Brooke Mueller's brother Scott.

Sheen lashed out at Denise by tweeting a pic of a chopped up baseball bat -- a souvenir from their wedding -- with the caption, "The lie is over. I'm done being treated like a relative with a one-way ticket. #DuhNeese."

Our sources say Denise is confused about Charlie's anger -- because as far as she's concerned ... he's still welcome to join her and the girls on the trip.

Clearly, that's not Charlie's understanding of the situation.

Tim Meadows WENT OFF on "Saturday Night Live" this weekend -- saying he'll NEVER WATCH THE SHOW AGAIN after they excluded him from a throwback sketch.

Meadows -- who appeared on the show from 1991 to 2001 -- swore off the show after watching the "Brasky Bar Guys" bit ... a reoccurring sketch he often appeared in during his time with the show.

Meadows tweeted: "They did Brasky without me" ... adding, "Not even a 'hey would you want to come to do one line and bring your kids to see the 5 directions...?' Nothing... Wow..."

"I will never watch SNL again."

Meadows also explained why he thinks he's persona non grata -- and it traces back to his movie, "The Ladies Man."

"Sorry the ladies man bombed," Meadows wrote ... "If it would have done better they wouldn't treat me like a red-headed step child."

After the rant, Tim cooled down and seemed to back off his comments ... saying, "I'm not mad at the show. I know what it takes to produce those sketches in a short amount of time. I talked to a friend on the show who said it WAS a last minute sketch."

"I acted like a baby. I'm happy for all of my friends success and will always be grateful and proud to have been a part of SNL. That being said don't forget to see 'Anchorman 2' coming soon to a theater near you."

Fun Fact: "The Ladies Man" bombed so bad it took SNL 10 years to make another movie.

File this one under: OOOPS.

"Wheel of Fortune" aired an episode last night that featured a puzzle with the answer "The Fast and the Furious" ... just days after Paul Walker died ... and now the show is in full spin mode.

During the show, producers ran a crawl on the top of the screen that read, "This episode was taped a few weeks ago, prior to the tragic passing of 'The Fast and the Furious' actor Paul Walker."

After the show aired, Pat Sajak tweeted, "Feel terrible about timing of 'Fast & Furious' puzzle tonight. Taped long ago & went out to 200 local stations days ago."

Paul Walker fans paid tribute to the 40-year old actor last night by holding a candlelight vigil on the site where he died.

The fans showed up in Santa Clarita Saturday evening ... leaving flowers and lighting candles in Paul's memory.

The vigil was held very shortly after law enforcement cleared the scene -- removing the bodies of Paul and the driver Roger Rodas ... as well as the charred wreckage of Roger's Porsche Carrera GT.

Charlie Sheen broke his promise not to trash the L.A. County Dept. of Children and Family Services ... because he just went off on the agency ... again.

Charlie tweeted the following, everything with the letters DCFS:

Short story ... Charlie is livid that DCFS is allowing Brooke to eventually establish full custody.

Frankie Muniz just had a frightening sense of deja vu ... because the 27-year old actor says he just suffered his 2nd mini-stroke in a year.

Frankie posted the health scare on his Twitter account, saying, "Almost a year to the day, I experienced another mini stroke. Hopefully that will be the last. Miserable." Muniz didn't say whether he needed any medical treatment.

Last year at this time ... Nov. 30th to be precise ... Frankie experienced blurred vision and had trouble speaking. Doctors diagnosed the episode as a mini-stroke, but said they didn't know what caused it.

We've reached out to Frankie -- who now lives in Arizona -- so far, no word back.

9:39 A.M. PT -- NeNe just posted a message on her website saying she went to the hospital after feeling short of breath... and was diagnosed with blood clots in her lung. She says she's recovering at home now and she's "thankful to be alive." She also reassured her fans she did NOT have a heart attack.

"Real Housewives of Atlanta" star NeNe Leakes was hospitalized this week for a mystery illness ... and the reality star says she's "blessed to be alive."

NeNe posted a photo of herself in a hospital room on Monday with IVs in her arms along with the caption, "My arms are hurting wit these IV’s #blessedtobealive."

Just one night before she tweeted that she had been sick for the past couple of days ... but never specified what she was suffering from.

There's one more clue -- one of NeNe's followers tweeted that he thought Leakes was suffering from exhaustion due to her "grueling schedule" ... and NeNe rewtweeted the message, adding, "I work my butt off."

Story developing ...