Weight Loss & Weight Gain

We busted Rob Kardashian's chops for packing on the pounds -- but the guy IS trying to streamline before Kim's big day ... so we're now told.

Celebrity trainer Gunnar Peterson is flying to Paris to train Rob and Khloe Friday, Saturday, Sunday and Monday, he tells TMZ. Gunnar says Rob was training 5 times a week, but then slowed to twice a week 2 weeks ago because of other commitments.

Lamar Sally tells TMZ he did NOT want Sherri Shepherd to sign an amendment to their prenup ... despite the fact that TMZ has a copy of the amendment in question.

Lamar insists, "I did not want her to sign an amendment to our prenup." TMZ broke the story, at some point during the marriage, he presented Sherri with a document that required her, among other things, to say she would commit to staying thin. We're told she refused to sign it.

And we're told Sherri's current lawyer is in possession of the amendment in question.

Sherri Shepherd's estranged husband wanted her to sign a document promising that she would enjoy sex and not get fat ... TMZ has learned.

Sherri and Lamar Sally signed a prenup before they got hitched in 2011. We're told at some point after the wedding, Lamar wanted an amendment to the prenup, which included the following:

-- "I respect my husband's opinions and recognize him as the leader of our home. I will always speak well of my husband."

-- "I enjoy having sex with my husband. I crave intimacy with him and want to be uninhibited and free in our lovemaking."

-- "MY BODY IS IMPORTANT TO ME. I STRIVE TO MAINTAIN A HEALTHY BODY WEIGHT AND EXERCISE AT LEAST THREE TIMES A WEEK." (HIS emphasis)

-- "It is my joy to submit to my husband as a way to honor God."

Of course Sherri rejected the amendment.

Lamar filed for separation earlier this month ... Sherri has since filed for divorce. They're fighting over custody of their unborn baby via surrogate.

We contacted Lamar's lawyer ... so far no word back.

Connor Cruise hit the beach on the Mexican Riviera ... and was almost unrecognizable with dreadlocks and a chinstrap.

Tom's son is 19 now ... and looking much different from the kid we used to see around NYC and L.A.

Connor was down in Mexico for the grand opening of a Hard Rock Hotel and Casino -- and of course Cinco de Mayo.

CC's been blowing up as a DJ -- we shot him about a year ago after a gig in L.A. ... and the difference is amazing.

What isn't Gilbert Grape eating? Leonardo DiCaprio hit the beach last week with his 21-year-old supermodel girlfriend looking rounder than usual ... but the fact is, Leo's so rich and awesome, it doesn't matter.

Days before dancing like a weirdo at Coachella, Leo and his GF Toni Garrn vacationed in Bora Bora. While Toni removed her top and unleashed her boobs, Leo removed his top and unleashed his as well.

And no one cared ... because he's Leonardo DiCaprio.

Seriously, though. We're big fans.

Chumlee from "Pawn Stars" was quite the popular guy this weekend ... hanging with a bevy of beauties at Rehab pool at the Hard Rock Hotel in Las Vegas.

He's lost about 75 lbs. in the last year, and stars on a super popular reality show, but we're sure the girls were totally into him for his personality.

Fitness guru Cara Castronuova isn't very discriminating ... she'll go on a date with ANYONE who's willing to pay the asking price -- $10,000.

Cara -- an ex-trainer on "The Biggest Loser" -- tells TMZ she's raising money for her charity -- Knockout Obesity -- by offering a romantic evening in NYC with anyone who ponies up 10 grand.

The best part ... she's open to men and women.

Cara says she hopes to go on at least 3 dates so she can send 50 overweight kids to fat camp. She's moved by the heartbreaking letters she gets ... including one from a boy who told her he desperately wants to shed lbs so other kids will stop pinching his stomach.

So what do you get for your money? Cara says the date consists of dinner at a really nice place and then seeing the new Rocky musical on Broadway.

But here's the deal ... you have to pick up the tab for dinner ... and pay your own way to NYC. She'll take care of the theater tix.

Gerard Butler looks ready to do battle with Xerxes again, flashing his buff bod on Sydney's Bondi Beach yesterday.

THIS ... IS ... Atkins? Jenny Craig? More gym, less lunch?

Don't expect Megan Fox to wear mom jeans after popping out another kid last month ... because she already lost all the baby weight -- in 5 freaking weeks!

Fox ran some errands Friday in Los Angeles with her other son Noah -- after giving birth to Bodhi Ransom in February -- and one thing is clear, girl was looking GOOD.

Just like most plus size girls who lose a ton of weight ... Jennifer Hudson is dumping her main squeeze -- Weight Watchers.

Hudson says her time with the diet company has been life changing ... a total understatement ... she went from a size 16 to 6, losing 80 lbs, using the product -- and got pretty damn hot in the process.

J Hud linked up with W.W. in 2010 after giving birth the year before.

Company honchos say they assume she will continue using their products.

It sure seems to work better than pizza.

Kesha is money ... well actually not anymore, because she's dropped the $ from her name.

Sources connected to the singer tell TMZ ... she wants a fresh start after her 60 days in rehab for an eating disorder, and the moniker she uses in her name reminds her of her "old self."

So from now on, it's simply Kesha.

We're told she's spending a lot of time with a therapist who will continue what she calls a work in progress.

Kesha is also following the advice she got in rehab -- get rid of the negative people in her life who contributed to the problems in her life that led to the eating disorder.

Ke$ha wants everyone to know ... she's still standing after her stint in rehab for her eating disorder.

The singer looks good after her 60 days of intensive therapy.

Ke$ha arrived at LAX and certainly looked happy. She says she's working on music again and feels great.

Ke$ha originally was supposed to spend 30 days in rehab, but she stayed twice as long ... on her own accord.

Prior to entering the facility , she had dumped a ton of weight and looked painfully thin.

Congrats.

"Biggest Loser" trainer Dolvett Quince still isn't happy with winner Rachel Frederickson's weight -- after she dropped from 260 to a scary 105 pounds -- but he tells TMZ, he's determined to get her healthy.

Rachel won Season 15 earlier this month ... but her dramatic weight loss shocked viewers, who claimed Rachel had lost TOO much weight, bordering on anorexic-looking.

And it appears Quince agrees -- he tells us, "We're going to get her healthy. She's going to be alright ... She's getting healthier every day."

Quince says he's still working with Rachel -- pro bono -- and has a plan to help her get better.

Christina Aguilera pregnancy by Matt Rutler was no mistake ... it was precisely planned as the final domino in an elaborate plot!

Her ultimate goal is still up for debate, but his goal's pretty obvious. Way to go, Matty!

Christina Aguilera knows how to keep things interesting -- it hasn't even been a week since she announced her engagement to a production assistant ... and now she's pregnant.

Christina and soon-to-be baby daddy/husband Matt Rutler met on the set of the 2010 film "Burlesque," where he worked as a P.A. And things heated up from there.

Aguilera announced they were engaged on Valentine's Day.

Christina gave birth to her first child -- Max Bratman -- in 2008.

Pretty crazy timing ... Aguilera lost a ton of weight just last year.

Ex-WWE superstar Big Daddy V was on the road to getting healthy -- losing about 100 lbs. -- which is why his death by a heart attack this week shocked everyone who knew him ... according to his wife.

Cassandra Frazier tells TMZ ... V started getting healthy last year after doctors said his blood pressure was way too high, and it was affecting his diabetes.

She says the wrestler reacted by removing most salt and sugar from his diet ... losing most of the weight in the last 6 months -- and doctors said his blood pressure dropped to a healthy level.

Obviously, the weight loss came too late ... or it was too much too quickly.

B.D.V. died from a major heart attack Tuesday night.

Cassandra says, "I guess the Good Lord wanted him... I wanted him too, but He won."