The German supermodel is already mum to Leni, nine, Henry, eight, Johan, seven, and four-year-old Lou and told E! News that she doesn't think she will be adding to her brood.
"I don't think so," said the TV star. "Four is great."
Heidi - who split from British husband Seal last year and is now dating her bodyguard Martin Kristen - admitted life is busy raising four kids and also having a career.
"I will sleep when I'm old, I don't have time for any of that now," laughed the 40-year-old.
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Take your time over affairs of the heart. If you've recently met someone interesting, enjoy getting to know one another. Don't rush the physical side of your relationship. An impulsive person like you must to protect their heart. That's hard to do after you've made an intense connection. Focus instead on forming a bond based on mutual interests and shared ideas. If your affection keeps growing, then you can pursue a more serious commitment. Until then, keep things light.More