Pro volleyball player Victoria Prince said she found out in mid-October that she’s expecting K-Fed’s fifth child, and friends fear the surprising baby news could send the emotionally fragile Britney back off the rails.

“Britney never wanted Kevin to have another child unless it was with her,” revealed a source. “She desperately wants to have a baby girl, and she had hoped Kevin would be the dad.”

Britney, meanwhile, appeared in Perth, Australia, donning a see-through T-shirt and no bra, her tits really getting into the spirit of being Down Under.

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When he joins the cast of “Celebrity Fit Club,” which premieres Feb. 14, he’ll land a $100,000 payday, according to several sources familiar with Federline’s negotiations.

That payday has come at cost, though. Federline has been overeating to get ready for the show. After he found out the casting was definite, “he started putting on even more weight on purpose,” a source told Us Weekly.

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It’s all part of a grand plan to make him a bigger brand post-weight loss, another friend of Federline’s said.

“He thinks that if he goes on the show, loses a ton of weight, and seems really likeable, he’ll get more deals afterward,” the friend said. “The way he sees it, he could have another show after ‘Fit Club,’ and that would open the door to working on music again, maybe even a fashion line.”

So let’s get this straight, KFed’s thinking went a little something like this: “People hate me and I’m not getting enough money for letting those kids live with me. I’ll get really, really fat so people will hate me even more (cause nobody likes a fatty), then when some reality show pays me to get skinny, people will love me and think I’m totally rad and will want to hear Popozao 2. It’s a plan.” We can’t find any flaws in that logic.

Federline is reportedly considering an endorsement deal with a company called EP-2 (Extreme Physical Performance). The source said the former back up dancer has been offered $2.5 million to become the new face of the fat-burning tool which is set to hit over 1,400 GNC stores.

While a rep for Federline has yet to comment, a spokesperson for EP-2 confirmed to RadarOnline.com: “Yes, we’re trying to do a deal with him, but nothing has been confirmed yet.”

$2.5 million. We’re just going to sit here and let you digest that information. (Dooo dooo dooo, puppydog tails and pussy willows and unicorn horns, dooo dooo dooo.) OK now. $2.5 million. Meanwhile Britney has been out there working her ass off to get all hot again (just look at the evidence here, it’s impressive) because she can’t make any money until she’s in top fighting form. But you know, maybe there’s a lesson here. If Kevin can rake in that kind of cash just for bettering himself, maybe that sort of incentive could work to better humanity as a whole. Throw a hundred grand at really, really stupid people to go to college, but make sure they don’t collect until they’ve made a really significant contribution to civilization, like inventing the next Snuggie.

ìSheíll ask him, ëWhen is the baby due?íî revealed a source.

Kevin, who cares for their two boys, isnít working and rarely exercises – which infuriates the sexy entertainer. ìBritney called him ëa fat housewife,í and he just laughed, said the source. ìHe says heís gained weight because he is happy and content, but Britney says he is just fat and lazyÖ

ìBritney insisted he go on a diet and stop showing their kids itís OK to be fat and sloppy,î said the sourceÖ

ìKevin was more than irritated by Britneyís diet demand, but heís going along with it for nowÖ

ìKevin says he doesnít have to worry about his looks,î said the source, ìbecause women still love him.î

The piece also claims that Britney calls Kevin K-Fatter-line, which, frankly, is quite witty, considering the source. We imagine that Brit's humor level doesn't go beyond announcing, "I farted," and giggling uncontrollably.

(She) left the stage dark and empty from about 8:30 p.m. until 9:05 p.m.; at about 8:45 p.m., a PA announcer told the crowd: "Itís become uncomfortable and unsafe for the performers, including Ms. Spears. The show will resume as soon as the air around the stage is clear. The performance will not proceed until the air clears."

She returned to finish her set, but not before imparting a few words of wisdom to those in attendance: "Thank you Vancouver. Drive safe, don't smoke weed and rock out with your cock out. Peace out motherfuckers!"

Oh, hey, speaking of fuckers of mothers, Kevin Federline is one. Because he is allegedly tossing it into ex Brit again. Or so Star magazine says:

"It's like they're newlyweds all over again," a family insider tells Star of Britney and Kevin, who have been traveling together for much of her Circus tour. "Brit and Kevin can't keep their hands off each other! The flings have made them both a lot happier." Britney loves it when Kevin puts the moves on her, and she's making her own too, says an insider. "She definitely knows how to fan the flames!" But there's one rather tall issue standing in the way ó Kevin's girlfriend, 5'10 ex-volleyball star Victoria Prince, who actually caught Britney and Kevin having sex on the sly! Victoria "caught him with his hand in the cookie jar," says a source.

We're guessing that means she caught him with his hand quite literally inside Britney's vagina, which we can see being affectionately called "The Cookie Jar". Or "The Walk-In Frozen Novelty Section of Safeway". Or "Hershey Park". No, wait, that's her b-hole.

Why is Kevin Federline breaking into the childrenís clothing business? In part because heís tired of paying for overpriced jeans for his kids Jayden, age 2, and Preston, 3.

Womenís Wear Daily reports that Federline dropped by the Project Trade show in Las Vegas Feb. 24 to research kids' clothing styles in the hopes of starting his own line.

ìItís a really tough business, Iím trying to take it seriously and make a quality product for kids but not have parents pay like $500 or something ridiculous for a pair of jeans,î Federline told WWD. ìYou buy your kids a pair of True Religions, then they roll around in the dirt like kids do and a $200 pair of jeans is gone. With this economy, Iím looking to do something much more reasonable.î

Man, KFed just speaks to us. We feel his pain. Just yesterday we dolled up our son Ceiling in the most adorable little Dolce & Gabbana outfit and he went right outside and started flinging around a pile of dog poop that our asshole neighbor left in the yard, smearing half of it on his sweater vest. What a waste. But then we saw a commercial for something called Old Navy where you can buy t-shirts for $5. That's a good deal! Maybe we don't need Kevin Federline's baby manpris after all.

Kevin Federline is working with ex-wife Britney Spears so that their young sons can spend time with Spears on tour ó but the family togetherness might come at a price.

Federline wants Spears to pay him for each tour date that Jayden James and Sean Preston attend, says a source with knowledge of the ongoing custody negotiations.

The price tag Federline is putting on quality time with mom: as much as $10,000 per city.

A rep for Federline didnít comment, but a Spears source said, ìThere is no way heís going to get that kind of money, if he gets any money at all. Sheís got good people on her side. Sheís not going to be taken advantage of.î

If Kevin works this thing right, he could be raking in cash whenever the boys leave his side. Sleepover at Britney's: $3,000. Day trip to Magic Mountain: $8,500. And if he hires a really, really good negotiator, he could work out in advance a $250,000 lump-sum payment for the next time Britney takes one of their kids hostage. Kevin may never have to develop any marketable skills.

K-Fed went public to paint himself as a straight-arrow, devoted single dad to their two sons, whose biggest concern is to ìshow them what itís like to have normal, stable lives.î What he left unsaid, sources tell Star, is that his definition of a ìnormalî life includes partying with hookers, smoking pot and spending wild, booze-filled nights in Las Vegas!

ìKevin loves his sons dearly, but he isnít always the model dad that he wants to appear to be,î says a family source. Another insider takes it a big step further: ìKevinís been trying to pull the wool over everyoneís eyes! He acts like heís the father of the year, but heís far from it. Behind the scenes, heís a pot-smoking slacker who doesnít have a job but still goes out of town to party for days and leaves his boys in the care of their nanny, Jenny. Sheís amazing, but sometimes itís a lot for her to handleÖ

ìKevin loves smoking weed and spends hours getting high and playing video games with his buddies,î the insider tells Star. The family source adds that Kevin is careful never to smoke it when heís around [his sons]Ö

ìHe loves sexy hookers and regularly parties with them at his home in L.A.î

What if we start learning that all of our assumptions are actually true? Catherine Zeta-Jones really is 54 years old. Denise Richards really is a man. Katie Holmes really does get shackled into a damp dungeon room every night.

"I think I married for the wrong reasons. Instead of following my heart and doing what made me really happy, I just did it for the sake of the idea of everything."

Hey, Britney, it's OK. At first, it's all fluttering hearts and romance, swept away by a rakish grin under a mop of cornrows and the swagger tucked inside stonewashed man shants. It's hard to resist the wiles after a few wake and bake sessions, and before you know it, you have a ring on your finger, a shaved head, and a negative bank account because your spouse spent two million on a blinged out set of sapphire and ruby rims that read "Pimp Daddy G". It's OK, we've all been there.

Britney Spears sexy pics are at MrSkin.com.