Chris Pratt Wants to Weigh 300 Pounds by November

While Anna Faris is slimming down after the August 25 birth of her son, Jack, the actress' hilarious husband, Chris Pratt, is packing on the pounds!

The Parks and Recreation actor, 33, has already gained 40 pounds since June in preparation for his role as a lawyer in the upcoming comedy Starbuck. The film centers around Vince Vaughn, 42, whose character learns he's fathered 533 children through sperm donations.

"This is what 275 looks like," Pratt tells Vulture while rubbing his belly. "All man right here."

Pratt says he hopes to weigh 300 pounds by November. To do so, he's been drinking "super gross but pretty tasty" weight gain shakes, in addition to eating at fast food restaurants. "I will hit a couple of burgers like it's laced with crack cocaine," he jokes. "Oooh, I love it."

One unfortunate side effect, Pratt admits, is that his en ergy is lower than ever. "If I just keep eating I can maintain a buzz, like a sugar food buzz. But if I'm in the background of a scene, I'm definitely sitting."

Pratt is no stranger to modifying his body for a role: He toned up to play a baseball player in 2011's Moneyball. "I just like to gain weight and lose weight," he tells Vulture. "It's a roller coaster. I just want to do this. I want to touch God."

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NEW PIC: Jessica Simpson Shows Off Toned Legs in Sexy Black Shorts, Sky High Heels

Slim and sexy mama Jess!

Three weeks after publicly debuting her post-baby body, Jessica Simpson stepped out in Los Angeles Monday, proving that her long hours at the gym are definitely paying off.

The Fashion Star mentor and mom to daughter Maxwell Drew Johnson, 5 months, showed off her lean sexy legs in black short shorts while heading to a photo shoot. Simpson -- engaged to Maxwell's dad, Eric Johnson -- accessorized her look with sky-high nude and black pumps and an oversized animal print handbag.

Simpson, 32, has been hard at work in an effort to lose the reported 70 pounds she gained while pregnant with Maxwell. After her daughter's May 1 birth, the singer has stuck to her Weight Watchers slimdown plan.

"I'm not a supermodel. My body is not bouncing back like a supermodel. I'm just your everyday woman who is trying to feel good and be healthy for her daughter, her fiance an d herself," Simpson -- who recently headed back to work shooting NBC's Fashion Star along with Nicole Richie and Louise Roe -- has said. "I feel like everybody can do what I am doing."

PHOTO: Stunning post-baby bodies

Attending Weight Watchers meetings with her friends and family members, Simpson says fiance Johnson's support during her weight loss journey has been invaluable.

"The fact that he loves me the way I am right now -- we're set," gushes the new first-time mom. "He knows I want to feel better in my skin."

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Skinny Bristol Palin Shows Off Amazing Legs, Booty at DWTS Rehearsal

Bristol Palin is tanned, toned and ready to cha cha again for week two of Dancing With the Stars: All-Stars!

The single mom of three-year-old Tripp impressed fans and critics alike with her hot new figure on the September 24 premiere of ABC's DWTS, and as the fifteenth season heads into its second week, Palin is having fun flaunting her slimmer self.

On Sunday, Palin, 21, headed to rehearsal with pro partner Mark Ballas in L.A. wearing gray clingy short shorts that showed of her muscular legs and toned derriere.

Bristol Palin at dance rehearsal for Dancing With The Stars on September 30, 2012.
Credit: Phamous/Splash News

Returning to the series two years after her season 11 stint on the show, Palin told Us Weekly she's developed a new-found confidence she hopes will take her all the way to the DWTS: All-Stars finale. And of course, a revamped diet and fitness routine have helped Palin (who placed third in 2010) whittle her middle.

"I'm definitely in better shape than I was last time, definitely. I'm just more active and I cut all the crap out of my diet! It's that simple," Palin said after DWTS judge Carrie Ann Inaba declared her the "most improved" returning contestant. "And my kid's a lot more rowdy, a lot more active. I'm running after him a lot! He's huge! He thinks he's a teenager already."

VIDEO: Kirstie Alley wants to become a "size zero" during DWTS: All-Stars

Palin's partner Ballas has definitely noticed an improvement in his celeb's work ethic. "Mark says he's like a chimpanzee and I'm like a turtle, poking out of my shell!" Palin has said.

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