EXCLUSIVE: K-Fed Ordered to Drop 45 Pounds for New Reality Show

Kevin Federline is headed to Vegas. But instead of going to gamble and party, Britney’s ex will be shooting a new reality show -- and RadarOnline.com has learned exclusively that he's been ordered to lose 45 pounds!

VH1 producers want K-Fed to shed the pounds during filming and have hired a celebrity trainer to help him lose the weight, we've confirmed.

In an exclusive interview with RadarOnline.com, trainer to the stars Chris Cormier, reveals how he plans to get Kevin to shed his beer belly.

"I put Kevin on a diet plan that consists of eating 6 meals a day, every three hours," Cormier told RadarOnline. "It speeds up your body’s metabolism and you start burning fat fast. I’ve been doing this for 30 years and I’m 42."

The noticeably heavier Federline arrived in Las Vegas on Thursday, where instead of starting his new diet, he spent the day relaxing at the Hard Rock Hotel & Casino Pool.

K-Fed and girlfriend Victoria Prince later headed to Wasted Space, where they sipped Grey Goose cocktails, later continuing their party at the new Paradise Tower Mega Suite.

A source tells RadarOnline.com that the show will also feature Victoria and Federline’s two sons with Spears, Sean Preston and Jayden James.

"Victoria is supposed to have a big part in the show,"” the source said. They’re billing her as Kevin's new Britney.”