Want to know how Lauren got fit?

When I was younger, I was really active and always playing sports,” says Lauren “LC” Conrad. “Then, the last couple years, I’ve just been so busy I haven’t had time.”

But four months ago, the 5-foot-6 Conrad decided to get fit again to feel better about slipping into her favorite Vitamin A and Pucci bikinis this season.

Enter Equinox trainer Jarett Del Bene, who created a shape-up plan for Conrad and her roommate, The Hills costar Audrina Patridge, that slimmed Conrad down 6 pounds — to 119.

Lauren Conrad’s Diet Conrad consumes 1,500 calories daily in six meals on the plan provided by Del Bene. “It’s taped up on our fridge,” she says of the fish-and-veggie — filled menu. “On cheat day, I usually eat carbs.”

Breakfast LC likes her coffee mixed with skim milk. A whole-grain waffle and 2 teaspoons of peanut butter give her calcium and protein. Other options: oatmeal or a bowl of Kashi cereal, both with skim milk.

Lunch A fiber- and protein-rich Cobb salad: turkey bacon, egg whites, veggies, avocado and balsamic dressing. Two more ideas: chunk light tuna and feta cheese on a bed of lettuce or a grilled chicken salad.

Midday Noshing on half a cup of low-fat cottage cheese and 10 raw almonds keeps energy up. A low-fat yogurt and seven walnuts will also do the trick.

Dinner A 4-to-6-ounce serving of a lean fish like tilapia or chicken breast is packed with protein. And salad or roasted vegetables on the side will help fill the stomach.

Lauren Conrad’s Workout Twice a week for an hour, Conrad lifts weights and runs on the treadmill. On off days, she hikes for 45 minutes in L.A.’s Runyon Canyon.

All the effort has been worth it, she says: “The first place I lost weight was my little belly… Now I’m happy about my arms because they were a little mushy!”