Funny guy Jonah Hill recently showed up at the ESPY Awards looking svelte—one of a growing number of stars who’ve dropped pounds for personal, business, and health reasons. From Seth Rogen to Drew Carey to Jerry O’Connell, see photos of weight-shedding celebs. AP Photo Funny guy Jonah Hill has made a name for himself as comedy’s chubby sidekick, but the actor recently showed up at the ESPYs looking like one svelte stud. Hill reportedly lost 40 pounds for his role in 21 Jump Street, but swears it wasn’t easy. “It’s not fun. I wouldn’t say it’s the most fun endeavor I’ve ever took on in my life—but it’s important,” he says, “And I’m enjoying it. If I eat something unhealthy now, I kind of feel a little weird and my body hurts.” He also admitted that the weight loss is not just for his new movie role. Hill said he “thought it was important to be healthier." AP Photo The actor turned screenwriter lost 30 pounds to play the superhero lead in The Green Hornet, but Rogen has admitted he’s had trouble staying slim. "I'm slowly outgrowing all the clothes I bought last year," he told Us Weekly. "It's a sad thing. I gave away all my fat clothes, thinking I won't need these anymore, but I do!" Luckily, longtime girlfriend, now fiancée, Lauren Miller doesn’t seem to mind. Getty Images; AP Photo Driving Vincent Chase’s Hummer all day can’t be good for staying fit, but Entourage’s “Turtle” has clearly hit the gym lately. Jerry Ferrara wowed Hollywood when he hit the streets with a friend this June. The star reportedly changed his diet to include tofu and organic produce and takes hikes through L.A.’s Runyon Canyon. AP Photo Po’ boys and Popeye’s chicken are never easy on the waistline, a reality Jason Segel learned firsthand while filming in New Orleans. The funnyman hit 245 pounds during his stint in the city, acquiring a belly he wasn’t proud of. His assistant even took the liberty to take a photo of it. "She came in one day to wake me up, and she took a bunch of pictures to show me what I had become,” Segel told David Letterman during a Late Show appearance. Segel made sure to slim down beforehand. Getty Images; AP Photo He was once the chubby friend in the coming-of-age classic Stand by Me, but Jerry O’Connell grew up to acquire hunk status, shedding every last inch of his baby fat. The star, who enrolled in law school in 2009, now stays fit by running and doing yoga with model-wife Rebecca Romijn and raising their twin girls. He even appeared “too thin” during his first year as a father. Everett Collection; AP Photo Drew Carey in size 33–34 pants? A few years ago the notion would have been laughable, but the star managed to lose 80 pounds after a strict diet and workout regimen. “It sucks being fat, you know,” the Price Is Right host told People last year. Carey even managed to fight off type-2 diabetes: “No medication needed.” AP Photo Everyone dreads turning 30, but TV host Carson Daly decided to do it the healthy way, dropping 30 pounds as part of a New Year’s resolution in 2005. “As I entered my 30s, I wanted to eat healthy and be healthy,” said the Last Call host. “I needed to get focused at work and in life. As you get older, it becomes a little easier somehow.” Daly also cites the California sunshine as a good fitness motivator. AP Photo He once played the burly former Uganda dictator Idi Armin, but Forrest Whitaker shed close to 70 pounds after becoming a vegetarian. The actor shocked the audience during the 2010 Oscars, appearing nearly unrecognizable in his slim suit and thick-rimmed glasses. Whitaker also adopted a no-meat diet to help avoid health issues such as diabetes and heart disease. Getty Images He made a name for himself as the big-boy star of Nickelodeon’s The Josh and Drake Show, but his increasing fame also came with a dramatic weight loss. By the end of the show’s fourth season, Josh had lost more than 100 pounds after hiring a personal trainer and changing his eating habits. Peck has since become a role model for combating childhood obesity. Getty Images Neville Longbottom a stud muffin? The 22-year-old Matthew Lewis shocked fans at the Harry Potter and the Deathly Hallows: Part II premiere, sporting quite the Hollywood makeover—a fit body, straight teeth, and a tux. The star also praised his character’s transformation, saying, "Jo Rowling did such a beautiful thing with the character [Neville] to have him come from a shy, bumbling little boy that was bullied and terrified of his shadow to make him into this hero.” Getty Images