June 01, 2015 12:05 PM

She’s a model mama — again!

Marisa Miller and her husband Griffin Guess welcomed their second child — another boy — on Friday, May 29, she confirms to PEOPLE exclusively.

Born at 11:23 p.m. in Santa Cruz, California, son Grayson Lee Bazyl Guess weighed 8 lbs., 14 oz., and measured 21 inches long. He joins big brother Gavin Lee, 2½.

“My son Grayson is healthy and such a sweet baby. I feel so blessed and excited to see both my boys grow up together,” the actress, 36, tells PEOPLE.

“I felt very prepared for labor this time around. I was a little anxious as to when it would happen, though. Having a toddler at home, you have more to organize to make sure everything is taken care of while you’re gone at the hospital.”

Courtesy Miller-Guess Family

Although the new mama admits labor was “so intense and the hardest thing I’ve ever done in my life,” the couple received quite the surprise when their son was born in the caul, meaning his face and head were completely enclosed in the amniotic sac.

“In honor of such a cool thing, we gave him the second middle name Bazyl, which means Kingly,” Guess tells PEOPLE. “The veiled birth’s meaning is coined as ‘Kings by right,’ so we felt it was a perfect opportunity to make his name reflect a cool story like this. And yes, that is a dimple on the baby’s smiling face!”

Adds Miller, “I had such an amazing support system at the hospital and my family, I felt totally taken care of.”

In an exclusive statement to PEOPLE in November, the actress announced she was expecting again.

“Being a mother has been the biggest blessing in my life. To get to experience it all over again is really exciting,” she said.

And things got even sweeter when the couple found out they would be welcoming their second son.

“It will be awesome for Gavin to have a buddy,” Miller told PEOPLE. “I never had brothers, so raising a boy has been awesome.”

In the weeks leading up to her baby’s birth, the expectant model, who stripped down to bare her bump for PETA’s new campaign, spent her time prepping her firstborn for his role as big brother.

“I got him a baby doll, so he gives the baby a bottle and he’ll talk to him and tell me, ‘I want to give him the toy, I want to chase him,’ ” Miller said. “For a while, the baby was in his tummy, then after he got older and he really started to see my belly, then he started to understand what I was saying.”

— Anya Leon with reporting by Sarah Michaud

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