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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