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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Working in isolation doesn't suit you. You're a social creature who gets your best ideas when collaborating with others. Unfortunately, that's not possible right now. Resign yourself to this difficult situation. If you do a good job, you'll pave the way for bigger and better assignments. Part of the problem is you lack experience. The only way to get the training you need is to do some volunteer work. Making a temporary sacrifice will eventually pay off. Be patient.More