Losing weight isn't easy--even for the rich and famous. But these dedicated stars have worked hard to stay slim, making lifestyle changes that put them on a path to better health. Click through to see celebs who've lost weight and kept it off, and then use Bing to see where each person started before making the transformation.
Related: Get inspired to lose weight! Download and print these motivational posters to hang on your bulletin board, fridge, or gym locker
Since joining Weight Watchers in 2009, this Academy Award-winning actress (her films?) and Grammy-winning singer (listen to her music) has dropped over 80 pounds from a size 16 (her size now?). Hudson, 31, has said learning to eat "real food" in moderation was the trick to getting slim.
Bing: See Hudson before she lost weight
When this retired NBA star (watch clips of him play) signed on as a Weight Watchers spokesperson in 2011, he clocked in at close to 350 pounds. To date, Barkley has dropped over 60 pounds and says he's feeling (and looking) the best he has in years. How old is the retired star turned TV analyst?
In late 2008, the Canadian comedian lost 40 pounds to portray the Green Hornet (see photos). Unlike other guys who have gone to extremes to lose weight only to gain it back later, the 30-year-old has kept the weight off with old-fashioned diet and exercise.
A lifelong junk-food-junkie, President Clinton used to use exercise as an excuse to chow down on cheeseburgers and fries. Until 2004, that is. That year, ongoing heart problems put him under the knife for a quadruple bypass (get details on the surgery). After that, Clinton (his age?) said goodbye to his beloved doughnuts, hamburgers and chicken wings. Transitioning to a vegan diet helped him lose weight (how much?) and strengthen his heart.
In 2009, Kelly Osbourne dropped 20 pounds while competing on "Dancing With the Stars." After the show wrapped up, she didn't just keep the weight off -- she continued to slim down (how much did she lose?). The 28-year-old says finding happiness with her vegan chef boyfriend, Matthew Mosshart, is ultimately what gave her the motivation to get healthy.
Raven Symone has been in the spotlight since she was a toddler, so it shouldn't come as a huge surprise that the stress of stardom led the former Disney star to gain some weight as a teenager (how old is she now?). She revealed to Wendy Williams that learning to keep calm and reducing her portion sizes helped her lose 35 pounds.
In 2011, the "30 Rock" star (his age?) made big changes to his diet after being diagnosed with pre-diabetes. On the red carpet at the 2012 Emmys, he told "Access Hollywood" that he achieved his 35-pound weight loss by cutting sugar from his diet. Being married to a yoga instructor (who's his wife?) may have helped, too!
In the fall of 2010, Drew Carey showed off his dramatic weight loss (how much?) on the cover of Parade magazine (see the cover). Today, the 54-year-old host of "The Price is Right" is still slim thanks to a running routine and a high-protein, low-carb diet. Losing the weight also meant the host could stop taking medication for Type 2 diabetes.
At one time, this funnyman weighed close to 400 pounds. No more -- 60-year-old Goodman told Men's Health magazine that quitting drinking and following an exercise program designed by famed fitness guru Mackie Shilstone helped him slim down.
The 58-year-old filmmaker behind documentaries that include "Bowling for Columbine" and "Sicko" lost 70 pounds after checking into the Pritikin Longevity Center and Spa (how much does it cost to stay a week?) in Miami. Moore told Mensfitness.com that he didn't follow a specific exercise plan -- his main focus was to "eat less and exercise more." Can't argue with that.
Ryan made headlines in 2012 when he revealed his new, slimmer self. After topping out at 348 pounds, the outspoken New York Jets coach (how old is he?) underwent lap band surgery in March 2010. How much did he lose in the two years following surgery?
The man behind one of the Web's biggest sources of Hollywood gossip struggled with weight his entire life, but in 2008 he made changes that stuck. Over the next four years, Hilton (his age?) melted away over 70 pounds -- today, he has a six-pack (see photos)!
It took this former Disney star (her age?) just eight months to squeeze back into her skinny jeans after the birth of her first child (see photos) in 2012. On Twitter, she revealed the secret to her slimdown: working out with LA-based personal trainer and boxing instructor Gabe Johns.
This "Hot in Cleveland" star is sure looking the part these days. Nearly four years ago, Bertinelli lost 50 pounds with the help of Jenny Craig (watch her as spokeswoman for the brand). The 52-year-old has kept the weight off by learning to control her emotional-eating habit and exercising regularly -- she even ran the Boston Marathon in 2010.
In 2002, the "Today" weatherman (his age?) underwent gastric bypass surgery and within eight months lost 100 pounds. But the operation didn't end up being the cure-all he had hoped for. Five years later, he regained 40 pounds during a family crisis. Consulting with a nutritionist and picking up running helped him shed the weight for good. What does he weigh in at now?
At 18, Lake starred in the 1988 cult classic "Hairspray" -- and weighed nearly 260 pounds. When she was offered a talk show in 1994 at the age of 24 (watch clips), she dropped 100 pounds to prepare, and her weight stayed at a healthy 150 for the next 15 years. Then, a stint on "Dancing With the Stars" helped Lake lose additional weight (how much?). Today, she says she feels better than ever, maintaining her slim figure with a meal delivery program.
The "American Idol" judge (his age?) once tipped the scales at this troublesome weight. Getting diagnosed with Type 2 diabetes in 2001 gave Jackson the motivation he needed to begin losing weight, and in 2004 gastric bypass surgery helped him lose a significant amount (how much?). He also learned to control his portions, and began walking for 35 to 45 minutes a day.
Starring as Pam Beesly Halpert on the hit sitcom "The Office" may lead you to believe that Fischer (her age?) has a trainer, nutritionist and chef at her disposal. Not so: Fischer told People magazine that she does it all on her own. How long did it take her to lose her pregnancy weight after the birth of her son in 2011?
On the Jenny Craig program, this 33-year-old actress lost 50 pounds, slimming down from a size 14 to this. She also discovered a love for running. "When I started running, I would run for one minute and walk for 10," she told People Style Watch. "Now I can run for two and a half hours straight. That's insane! I never would have thought six months ago that I would be able to run that much."
Sparks (her age?) unveiled her 50-pound slimdown at the 2012 Teen Choice Awards. "There is no secret," the Season 5 "American Idol" champ shared with Us Weekly. "It's just better eating and working out! It's definitely a daily thing."
On "Seinfeld" (watch clips), Alexander's character George Costanza's schlumpy physique (see photos) was often the butt of jokes. Today, 53-year-old Alexander is 30 pounds lighter thanks to Jenny Craig and regular workouts.
In 2009, Gervais was home in England for Christmas when he realized he had eaten 11 sausages in one sitting. "I just thought, 'This is getting ... ridiculous,' " he told Men's Health magazine in 2012. Since that sausage-induced meltdown, running and a healthier diet have helped the 51-year-old comedian lose the pounds (how much?).
Like many women, this actress and comedian (her popular show?) packed on pounds during pregnancy. Joining Jenny Craig helped the 42-year-old mom of two lose 38 pounds and get her pre-baby body back. She also learned to love running and finished the Rock and Roll Half Marathon in Las Vegas in 2011.