April 24, 2015 04:00 PM

Jeff Vespa/Getty

Kimora Lee Simmons may have already given birth three times, but that didn’t make welcoming her son Wolfe any easier.

“My fourth delivery was definitely the most challenging — all natural and with no drugs!” the mommy mogul, who shared her son’s first photo Friday on Instagram, tells PEOPLE exclusively.

“It really shows that moms-to-be have the power to deliver any way they choose. Choice is what’s most important for women — across the board.”

Simmons, 39 — also mom to daughters Ming, 15, and Aoki, 12, with Russell Simmons, as well as 5½-year-old son Kenzo with Djimon Hounsou — says her newborn son already shares a lot in common with his dad Tim Leissner.

“Wolfe was a big boy! Handsome just like his father,” says Simmons, who recently added the energy drink Celsius to her business portfolio and is busy working on the Spring 2016 collection of KLS Kimora Lee Simmons, her designer line of apparel and accessories, with a Los Angeles boutique slated to open this spring.

She adds, “[Wolfe was] 11 lbs. — a lot of work. But a labor of love! We’re all so happy he’s here.”

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— Patrick Gomez

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