Rebecca Black I'm Not a Singer I'm a BIKINI Model

There is a MAJOR Rebecca Black crisis on Facebook -- with allegations of deception, identity theft ... and most importantly a smoking hot bikini model ... who happens to be named Rebecca Black.

Turns out, there's more than one person on Earth named Rebecca Black -- one of whom is a self-described, "fitness bikini competitor." And she has the photos to prove it.

Black (bikini) tells TMZ ... sometime in the past week, her friend list on Facebook exploded from 800 friends to 73,000 ... and she had no idea how it happened. Black started getting emails from upset fans of the singer -- accusing her of intentionally hijacking the 14-year-old's page ... but Black (bikini) claims she never tried to steal anyone's identity.

Black (bikini) insists Facebook is to blame for somehow "merging" her account with Black's (singer) without her permission.

We called Facebook for comment -- so far no word back.

Still, there is a silver lining here ... check out the AWESOME bikini pics -- Fun. Fun. Fun. Fun. Fun.

Twin Sisters Jessica and Liz on "SWEET VALLEY HIGH" 'MEMBA THEM?!

Twin sisters Brittany and Cynthia Daniel are best known for playing Jessica and Liz in the '90s school drama TV show "Sweet Valley High." Guess what they look like now!

Super Hot Stars KEEPIN' SUPER COOL

Summer is slowly coming to an end -- check out how some of the hottest stars in Hollywood kept cool this season.

Hilary Swank Million Dollar Body

Two-time Oscar winner Hilary Swank showed off her toned bod in a black two-piece in Kauai on Thursday.

Boys don't cry when they see the 37-year-old in a bikini.

Bishop Don Juan Pimpest Tattoo Pics EVER!!

Bishop Don "Magic" Juan -- Snoop Dogg's spiritual advisor -- left a permanent mark on himself the other day ... tatting up his arms with some brand new ink ... and we got the pimptastic pics.

The procedure took place on Monday inside Bishop's L.A. home -- and no, your eyes don't deceive you ... one of the tats reads "Let the Chuuuch $ay Amen."

The other reads "333" -- and we're told the numbers are significant because they were handed down to him by God. Go figure.

Green is for the money. Gold is for the honeys.

Carrie Fisher Heavy Makeover After Dropping 50 Pounds

Looking more like Patricia Heaton, former "Star Wars" babe Carrie Fisher was spotted in NYC on Wednesday (left) appearing refreshed and more, er, rested than she was back in 2009 (right).

The slimmer, tanner and smoother 54-year-old recently opened up about losing 50 lbs on Jenny Craig.

The force is definitely with her.

Hot Brazilian Model I'm Just As Dirty As Bar Refaeli

Apparently, Bar Refaeli has started a trend ... because just a few weeks after the Israeli model dipped herself in mud at the famous Dead Sea ... some smokin' hot Brazilian model tried to show her up.

Model Suelyn Medeiros (left) -- whose butt you may recognize from the SEXIEST DUI EVER -- mucked around in Israel this week ... and fortunately for the rest of the world, she brought along a bathing suit and a camera.

So we gotta ask ...

Megan Fox's Dress Curves Your Enthusiasm

Megan Fox left little to the imagination by rocking a tight, form-fitting mini dress in L.A. on Monday.

Despite getting fired from the most recent "Transformers" flick, the 25-year-old has racked up a great body of work.

'My Best Friend's Wedding' Star Is RIPPED!

It's been 14 years since "My Best Friend's Wedding," but Dermot Mulroney proved he's still got the bod of a newlywed by going on a shirtless run and showing off his buff chest and abs in Santa Monica this weekend.

Unfortunately, the fit 47-year-old is married in real life too.

Octomom Scarring Results of Pregnancy

After winning some sort of "celebrity" boxing event in Fort Lauderdale this weekend, Octomom Nadya Suleman showed off what a shark attack giving birth to eight kids at once will do to your body.

She's scarred for life.

Mary Ingalls on "Little House on the Prairie" 'MEMBA HER?!

Melissa Sue Anderson is best known for playing the eldest daughter -- Mary Ingalls -- on the tv series "Little House on the Prairie." Guess what she looks like now!

Slash & Criss Angel The 'Barbarians'?

Former Guns N' Roses member Slash and Vegas magician Criss Angel appear to be the douchey style inspirations of "Conan the Barbarian" remake star Jason Momoa.

The cheesy accessories don't lie.

We're just sayin'.

The Guys in LMFAO Who'd You Rather?

Motown record label founder Berry Gordy's son Stefan Kendal Gordy aka Redfoo, 36, and Berry Gordy's grandson Skyler Gordy aka SkyBlu, 24, of LMFAO rocked their hit song "Party Rock Anthem" at an event in Pennsylvania on Wednesday.

Question is ...

More Who'd You Rather?

Bar Refaeli Greece'd Up Bikini Pix

Bar Refaeli went to Greece ... put on a tiny bikini ... and once again forced Leonardo DiCaprio to question his life decisions.

Zooey, Rashida or Elizabeth Who'd You Rather?

Zooey Deschanel, Rashida Jones and Elizabeth Banks made nice at the premiere of their film "Our Idiot Brother" in L.A. on Tuesday.

Question is ...

More Who'd You Rather?

Lady Gaga Board This Way

Trading her meat dress for a wet suit, Lady Gaga followed in Lindsay Lohan's footsteps and went surfing in Mexico on Tuesday.

Gaga stripped down to a bikini and was actually able to stand up on the surfboard.

Forget all the ridiculous outfits, horns on her face, or bizarro music videos -- this is the weirdest thing she's done yet.