Harrington's nickname is "The Bun Lady."
"It's growing on me," she says of her nickname with laughter to Early Show correspondent Melinda Murphy. "I didn't name myself that. I can promise you that."
Harrington owns the Tennessee Bun Company and claims to make more buns per hour than anybody else on the planet.
"We make over 1,000 buns a minute," she says, "It's over 60,000 buns an hour. It's a lot of buns."
But Harrington wasn't always all about buns. In fact, she started out in real estate.
"When I started the real estate business, I did use all my own money, $587," she chuckles. "I bought my plywood. I bartered for my office space, leased my desk and it grew from there."
It was a $587 investment that would eventually lead to millions. Of course, Harrington's path to fortune was anything but direct. She took her real estate company one step further and launched a construction business, too. But running booming businesses and being a mom is tough.