Kristen Thompson was filling her car up with her food shopping when a man suddenly attacked her, grabbed her purse and tried to run off.

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Despite being nine months pregnant, the outraged mother-of-two (now three) chased after the mugger and tried to confront him, but he pushed her down.

Speaking with ABC 12, she explained that her purse contained too many important keepsakes to let go.

The brave mum said: "My purse is my life. It has everything and anything that you can need, possible. Comes down to bills, the kids' insurance cards.

"We got around the corner on Krogers, and he pushed me down," she said.

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Thankfully for the pregnant vigilante, she spotted a group of friends nearby and yelled for them to help her.

Working together, they managed to get Kristen's purse back and restrained the mugger until police arrived.

But the drama was just beginning.

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Kristen revealed: "[It] sent me right into labor. Soon as I got up, I was having contractions."

Five hours later, after an emergency C-section, Joseph was safely in his mother's arms.

The proud mum revealed: "His name is Joseph Alan Alexander-Thompson. He weighs 7lbs, 7 oz.

"He's the cutest thing in the world. He's such a ham. In the hospital, all the nurses loved him 'cause he was the cutest baby on the floor."

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Thank goodness!

Stock images used throughout.