From PEOPLE Magazine Click to enlarge
Heather Locklear

"Maybe 40 is the new 30," says TV's consummate California girl, 44. And she's living proof. After splitting from husband Richie Sambora in February, the mom of daughter Ava, 8, just keeps getting hotter. So—the secret?

RUN: "I get on the treadmill, and I do lunges. I do weights and all the boring stuff, and I also go to the batting cage, play golf with my dad or play sports with Ava. I've always been athletic."

SUN: Strictly the fake variety. "I haven't tanned since I was 30. I use self-tanner or get a spray-on. I try to keep my face and chest out of the sun."

FUN: "I don't say, 'No more bread or pasta.' I just don't have five platefuls. I've always been a red-meat eater. I try to eat a little less and be aware."

Marcia Cross

TALKS ABOUT BEING COMFORTABLE IN HER OWN FLAWLESS, PORCELAIN SKIN AT 44:

"Do I wear makeup every day? Oh my God, no! Unfortunately, I have no qualms about leaving the house with no makeup. That's a problem! But I honestly don't even care."

"I'm always having a bad hair day. I don't even notice. I definitely go out."

"My favorite beauty product is my fiancé, Tom [Mahoney]. It's true. I think that beauty comes from being happy and connected to the people we love, and his love makes me feel beautiful."

"This is the time in my life when I've felt the most beautiful. Absolutely. I'm at peace with myself, I'm in love, and I'm well-employed. My inner world and my outer world are flowing nicely."

"My worst feature is my messiness! It takes me forever to keep track of myself."

"I think life just gets better and better as you get older."

Julia Roberts

The Oscar winner and mother of twins has reinvented herself, making her Broadway debut in Richard Greenberg's Three Days of Rain. With the support of husband Danny Moder—who helped her rehearse—and inspiration from 17-month-old Hazel and Phinnaeus, Roberts, 38, says, "I feel fantastic. Being a mom enriches your life, and as an actor you draw from experience, so it must enrich your acting. I'm very happy right now." And it shows. "She really works hard to balance her life," says Rain producer and friend Marc Platt. "She's intent on having her professional life, and she's equally intent and focused on being a great mom and a great wife. She's a very grounded individual."

Nicole Kidman

THE WORLD-CLASS BEAUTY, 38, SHARES THREE SIMPLE BEAUTY RULES:

"Don't wear too much makeup."

"Stay clean and fresh, and try not to smoke."

"If you have fair skin, stay out of the sun and wear a hat. I couldn't live without sunscreen."

Kirstie Alley

Having dropped 64 lbs. since January 2005, Kirstie Alley is once again turning heads—and it's a heady situation. "I feel very extroverted again," says the 55-year-old actress. "My attention can be on the person in front of me instead of wondering, 'Oh my God, are they thinking I look like Fatty-Go-Lotty Goes to the Circus?'" Life is "easier" on every level, she adds. "You can go, 'Oh, that's a pretty dress, I'll buy that.' Also, I didn't know how physically impaired I was until I got thinner again. You move faster, you walk up and down stairs quicker." Alley's kids are embracing her transformation. William, 13, tries to play matchmaker, and Lillie, 11, has taken to wearing her mother's hip new clothes. "It's flattering," Alley says. As for plastic surgery, the actress has no plans to go under the knife—even to remove excess skin from her weight loss. "I'm not an advocate," she says. Her new goal? In November she'll go on Oprah wearing a bikini. "I'm not saying I'm going to look like Gisele. But you're going to see a girl who's worked on herself."