SEX sirens Rebecca Loos and Abi Titmuss are going bumpers to bumpers in a TV battle to bed a celeb...with curvy Kelly Brook providing a blow-by-blow commentary.

The News of the World can reveal that all three girls have signed up for new ITV1 reality show Celebrity Love Island.

Armed with only their silicone enhanced bazookas, Becks's ex, Abi and three other single stunners will be fighting over five famous fellas.

But host Kelly's natural curves could leave them both in the shade.

Our exclusive pics of Abi mucking about in Tenerife show how she'll be fighting them on the beaches.

But as both Rebecca, 27, and Abi, 28, like boys AND.

Wild

A show insider said: "Abi's made sex tapes and Rebecca even pleasured a pig on The Farm—who knows what will happen in paradise!"

However, Abi will be doing her very bust to get back with playboy Calum Best, who has also signed up.

News of the World readers already know what to expect after we published CCTV pictures of him romping with Elizabeth Jagger in a nightclub doorway in February.

And he added Abi to his list of conquests last month.

The insider added: "Calum is wild when it comes to women—and he doesn't seem to mind cameras!"

Blue singer Simon Webbe, ex-Manchester United star Lee Sharpe, Emmerdale love rat Ben Freeman and former EastEnder Judi Shekoni, who played maneater Precious, have also all booked their places.

They will jet out to an island in Fiji this month—and the more they score, the, er, more they score.

But Kelly is strictly offlimits —she's even bringing movie star fiancé Billy Zane along with her.

One thing's for sure, the viewers just can't Loos.

TODAY we confirm the lusty line-up of stars who'll turn Celebrity Love Island into TV's biggest bonk fest.

Gorgeous glamour girl ABI TITMUSS, 28, and sleazy senorita REBECCA LOOS, 27, will frolic in bikinis in the ITV reality show.

They'll be joined by casanova castaways including CALUM BEST, 24, FRAN COSGRAVE, 26.

And Blue's SIMON WEBBE, 26, has already packed his condoms as producers hope to see sex, sex, sex on the paradise isle of Fiji.

Other randy eye candy include Atomic Kitten LIZ McCLARNON, telly host JAYNE MIDDLEMISS, ex-EastEnders pair MICHAEL GRECO and JUDI SHEKONI and footballer LEE SHARPE.

They'll be urged to seduce each other when the show goes head to head with Big Brother 6 at the end of the month.

A show insider said: "We've assembled the randiest stars around - that's why it's nicknamed Celebrity Shag Island.

"They're all single and up for fun.

"A lot already have reputations for enjoying the company of the opposite sex - and then some." Bosses are even in talks to nab former Baywatch babe Pamela Anderson.

The insider added: "Pammy would be perfect. We're sure everyone would love to see her back in the surf and watch the lads vying for her attention.

"But we've already lined up a lot of bikini babes and hunks in trunks.

"The bosses are saying they don't want a full-on sex romp but they're secretly hoping for some action."

ITV is jetting at least 16 stars out to the Pacific. A dirty dozen will appear on the show with four on standby.

Those on the subs' bench include Sven Goran Eriksson's mistress FARIA ALAM, Liberty X singer JESSICA TAYLOR, model JAKKI DEGG, ex EastEnders babe BROOKE KINSELLA and swimming champ SARAH PRICE.

The insider added: "Temperatures will rise and not just because the weather in Fiji is 30C and above. It'll be a sizzling show."

An ITV spokesperson confirmed: "We'll announce the full line-up closer to transmission."