It’s the topic on lots of people’s lips — and hips. Weight loss. Especially in Hollywood, where thin is always in. We looked at various stars’ battles with the bulge — and how they deal.

Sharon Osbourne: Welcome to your 60s! Osbourne turned the big six-o Tuesday and had a lot to celebrate. The music manager was also mother of the groom last weekend when son Jack married Lisa Stelly, the mother of his baby daughter, Pearl. Sharon is also a colon cancer survivor, having battled the disease 10 years ago.

Today her slimming secret is Atkins, but don’t call it a diet, she told The Miami Herald. “What I eat consists of protein, vegetables and fish,” she says. “Usually my breakfast is anything from egg and bacon to avocado and sprouts. My lunch might be fish or chicken and vegetables, [e.g.] string beans and broccoli, or a chopped salad with egg, chicken, ham, tomato, cucumber and cheese. Dinner might be chicken, steak or fish and a small salad.”

Sharon — who has a weakness for French fries with mayonnaise — allows herself to snack on Atkins bars (Chocolate Coconut or Nutty Fudge Brownie). “I usually cut one bar in half and have half at lunch and the half after dinner in the evening. This helps with my sugar cravings,” she says. If The Talk co-host is short on time, it’s a shake (“preferably chocolate”) or any of the plan’s meal replacement bars.

Osbourne’s new outlook involves something she used to abhor: exercise. “I feel like I want to take care of mind, body and spirit,” she says. “At first I was very reluctant and had to be dragged kicking and screaming into a gym, but I must admit that I enjoy it now. So five times a week it’s cardio on a bike or cross trainer and weights to build muscle.

Molly Sims: The model and new mom is refreshingly honest about how tough it is to get back to her pre-child days. “You have to think about a baby first, and you have to get off all of that fat and weight — and that’s a whole thing on its own,” Sims said recently at Tracy Anderson’s “The Pregnancy Project” DVD launch in NYC last week. “It’s literally the hardest thing I’ve ever done.” The 39-year-old uses fitness trainer Anderson’s tips that include working with a trampoline, hoops, exercise ball and weights. Tracy, incidentally, will be in town for “Miami Detox Week” Nov 3-9 at the Hyatt Regency, Coral Gables (tracyandersonmethod.com).

Kim Kardashian: Bf Kanye West has said he doesn’t mind more to love, but lately the Kourtney & Kim Take Miami princess has a little more to love than usual. Rumor has it Kim will be embarking on a drastic liquid diet — the same one Beyonce used for Dreamgirls — so she can be the model for West’s clothing line. Beyonce’s so-called 14-day torture (based on the book med The Master Cleanse by Stanley Burroughs) consisted of drinking a spicy sweet concoction of lime or lemon juice, maple syrup, and cayenne pepper mixed with water 6-12 times a day, along with an herbal laxative tea twice a day.

Sarah Palin: While her daughter Bristol hoofs it up on Dancing with the Stars, the former VP candidate is focusing on a fitness book. She told People magazine that it’ll recount how the Alaskan family gets their “energy and balance as we still eat our beloved homemade comfort foods.” Expect moose recipes, no doubt.

Lisa Lampanelli: The comedian admitted to Dr Oz that about five months ago she had gastric sleeve surgery, a laparoscopic procedure in which about 85 percent of the stomach is removed so that it takes a tube or “sleeve” like shape. Lampanelli said she was addicted to food and felt there was no other way out. “I got sick of trying everything.” After the surgery, which decreases the stomach size to limit the amount of food eaten, she shed more than 80 pounds.

Madeleine Marr