(Cover) - EN Showbiz - Heidi Klum won't go under the knife unless she's "not happy with herself anymore."

The stunning 38-year-old model and mother of four is deeply concerned about her appearance.

Although Heidi cares about maintaining her beauty, the star doesn't consider cosmetic surgery to be essential.

"[I might have plastic surgery if] I'm not happy with myself anymore," she told People magazine. "Then I probably would. I don't know if that's going to happen because it's just not really what I find attractive. Then again, maybe in 10 years I'll look at it differently, and I'm like, What was I thinking when I was turning 40? Now I'm turning 50! What the heck?' "

The beauty prefers to perform less invasive style techniques to perpetuate glamour.

"I'm not really blonde, so I colour my hair every four weeks," she revealed. "I probably have the most used and abused hair on the planet." (C) Cover Media