Jane Fonda is still red hot at 74! (George Pimentel/WireImage)Jane Fonda's iconic workout videos were an essential part of the 1980s and became so popular that they are credited for giving birth to a new industry. Now almost 75, the actress is still sculpting and toning — and has a new DVD. However, she's also had some surgical help to stay looking camera ready.

Hayden Panetierre on the cover of Self's December issue. (Kenneth Willardt/Self)Hayden Panettiere has been a vocal advocate for endangered whales for a few years now. She's appeared in the Oscar-winning expose documentary "The Cove," flown to Japan to try to take on local governments when it comes to whaling laws, and serves as spokesperson Whaleman Foundation, which fights to protect whales and dolphins. So we kind of figured she'd be a vocal vegetarian, too. Turns out salads just don't cut it for her … and she even eats fish.

"I tried vegetarianism, but my body didn't respond well. I was low-energy. Now I make egg-white scrambles with veggies for breakfast. For lunch, I have chicken or fish and greens, which are good for keeping your system working," she says in the December issue of Self. "I'm a fan of sushi for dinner, as long as the fish aren't endangered. When I indulge, I try to do it in the morning so I can burn it off. It's my responsibility to be healthy and, no, I'm not going to starve. I'm sorry — I can't be full on salad."

Matthew McConaughey (PacificCoastNews.com)By this point, you've probably seen the scary skinny photos of Matthew McConaughey, who has shed 38 pounds for his role as an AIDS patient in the movie "The Dallas Buyers Club," which he started filming this week. Now, for the first time, the actor is speaking out about his dramatic weight loss, and reveals how he's feeling having reached his goal weight of a shocking 143 pounds.

Anne Hathaway (Annie Leibovitz/Vogue)It was for the love of her craft that Anne Hathaway whittled 25 pounds from her already thin frame earlier this year. Cast as Fantine in the upcoming big-screen adaption of "Les Misérables," the actress wanted to bring authenticity to her role as a dying prostitute, and it seems she was successful as she appears very gaunt in the trailer. In a new interview with Vogue, Hathaway talks about being on a "near-starvation diet" to slim down for the flick, and how her dramatic weight loss impacted her long after the cameras stopped rolling.

Jennifer Hudson on the cover of the December issue. (Ruven Afanador/Redbook)By now you already know that Jennifer Hudson has lost a lot of weight and looks pretty amazing. And on the cover of the latest issue of Redbook she shows off her trim figure yet again. And while she may look as confident as ever, she admits she's still not completely comfortable in her own skin … now that it's on such a slim body.

Read more from the Jennifer Hudson cover story

"I'm getting used to my new self more than anything else. I got used to being plus-sized and knowing how to be that," Hudson says in the December issue, "whereas this is like, 'Okay, who am I?' I keep thinking that I probably need an extra-large or a large and the stylist is like, 'No, you need a medium or a small.'"

(Carter Smith/Elle)Jennifer Lawrence may star in "The Hunger Games," but she vows that she will never engage in extreme dieting just to fit into Hollywood's rail-thin world.

Cameron Diaz (Steve Granitz/WireImage)Cameron Diaz may be one of the leggiest blondes in Hollywood, with as svelte of a figure now as she had when she first hit the big screen nearly 20 years ago. So when it comes to what the 40-year-old actress would say she likes to snack on, you'd probably assume she'd push something healthy, like yogurt, almonds, or baby carrots, right? Wrong.

In a new interview with Elle UK, Diaz admits that not only is her favorite snack food something that's completely unhealthy, it's actually, well, kind of gross: pork scratchings.

"Oh, that's my favorite snack in the whole world!" she says in the magazine's December issue.

Melissa McCarthy (Brian Bowen Smith/Good Housekeeping)Melissa McCarthy's realistic portrayal of a plus-sized character on TV's "Mike and Mike" has won her a devoted fan following — and an Emmy! — but that doesn't mean the actress is always completely comfortable in her own skin.

In the December issue of Good Housekeeping, the 42-year-old opens up about her ongoing struggle to lose weight. "Sometimes I wish I were just magically a size 6 and I never had to give it a single thought," admits McCarthy, whose hilarious turn in "Bridesmaids" also helped put her on the map. "But I am weirdly healthy, so I don't beat myself up about it — it wouldn't help, and I don't want to pass that on to my girls."