Heidi Klum definitely put her fit bod to work while on vacation!

The model was spending some family time in Hawaii earlier this month, when her son and nanny were swept to sea by a giant riptide.

Luckily, Heidi's parents were on hand and took care of her other kids (Leni, Johan and Lou) while Klum charged to water to rescue her son Henry,7, and their nanny.

Check out the clip above to hear Heidi explain the scary incident.

Shockingly, it was the nanny that needed the most help. The 39-year-old has enrolled all of her children in swim lessons, so Henry was able to save himself by swimming diagonal out of the current.

The "Project Runway" star definitely has a strong maternal instinct -- and is clearly in amazing shape to pull a grown woman out of the water!

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