Cindy Crawford says not smoking and keeping out the sun helps her stay young.

The 44-year-old model insists her beauty regime is simple and looks youthful thanks to a number of different things.

She said: "It's combination of a lot of things. I don't smoke, I don't take too much sun on my face - all of those things. If you keep doing them enough over the years, they add up.

"It's not that I work out every day and I'm not ever on a diet - I just eat healthy. I'm never off the wagon, so I never have to get back on the wagon. I think it's about maintaining a healthy body weight."

The star - who has children Presley, 10, and Kaia, eight, with husband Rande Gerber - also admits she is happy with her career and lives a good life, which helps her look good.

She told Us Weekly magazine: "If you're happy and you're doing work that you enjoy - for me it's about being a mother - that comes out in how I look."

Recently Cindy admitted she wouldn't worry about looking older as the years pass by.

She said: "When you don't have anything interesting to do, you start thinking too much about what you don't have anymore. When you can appreciate fulfilling things like family, work, friends or the possibility of helping other people, you will have a focus. The list could go on.

"But to be standing in front of a mirror and to moan, 'Oh my God, I've just found another wrinkle!' That's embarrassing. I don't have time for that."