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MIAMI (CBSMiami) – Millions of Americans are using their passions to make a profit.

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The so-called side-hustle trend has already proven lucrative among baby boomers and now millennials are cashing in.

Tina Gong spends her days designing the website for a small marketing company. That job inspired her to turn her passion for designing tarot cars into a second job – also known as a side hustle.

A recent report found more than 44 million Americans have a so-called side hustle. It’s a way to earn extra cash on the side.

Chris Guillebeau is the author of “Side Hustle: From Idea To Income In 27 Days.”

“It’s something that I can point to and say okay, I got my paycheck from my employer and that’s fine and I love my job but I’m also building something for myself as well,” said Guillebeau.

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Younger baby boomers, ages 53 to 62, earn the most from side hustling, pulling in at least a grand a month. But 32-year-old Jennifer Li claims her side job, organizing trips for young professionals, is equally lucrative.

“I’d say that I can cover all my rent,” she said.

An event planner by trade, Li says there’s an added benefit.

“I get to travel for free which is the biggest perk. Building a community of people that I admire and love, that’s the intrinsic value that I go for,” said Li.

Gong spends about three hours every night crafting intricate designs on her tarot cards. She then sells them online starting at around $45.

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If you’re interested in getting a side-hustle going, Guillebeau recommends taking a look at the skills you already have and generating ideas without spending a lot of money. That money would, of course, need to be reported to the IRS.