August 09, 2016 10:00 AM

Surprise: There’s another Stuber baby on the way!

Model and actress Molly Sims is pregnant with her third child, she confirms exclusively to PEOPLE.

“It’s a Hail Mary!” Sims, 43, tells PEOPLE about her pregnancy. “I’m so happy — we’re so blessed. We were so shocked, but we’re thrilled.”

Sims and her movie-producer husband Scott Stuber already have two little ones: 4-year-old son Brooks Alan and 16-month-old daughter Scarlett May. Their new baby will arrive at the end of the year.

Erica Hampton

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The pregnancy was unplanned, Sims says, and jokes it’s the result of “what happens when I go visit my husband on the movie set.” She adds, “Being 43 is a little worrisome, cause I’m like ‘Okay, you are going to be 90!’ But then Mick Jagger [is having a baby at 72] so we’re like okay, we feel good about ourselves.”

It hasn’t been all smooth sailing so far, though.

“I have never had more morning sickness in my life — I have been sick from the moment I wake up to the moment I go to bed,” Sims admits. “I have thrown up in the Bristol Farms parking lot and I have thrown up outside of a restaurant. It’s just bad!”

Allen Daniel

Thankfully, the mom-to-be says it’s getting better — just in time for an exciting new business venture.

Sims is also launching her own lifestyle YouTube channel on Aug. 16, where viewers will be able to follow along on her journey to becoming a family of five.

Related Video: Molly Sims Shows You How to Tie Your Scarf Sexy!

“The Molly Sims YouTube channel is a new lifestyle destination from model, actress and New York Times best-selling author, Molly Sims. Sims teamed up with Awestruck to launch her YouTube channel and incorporate it into their popular digital network for millennial moms,” the channel’s description says. “It will feature original lifestyle content on topics like health, fitness, motherhood, DIY projects and recipes that she has worked with Awestruck to develop, film and produce.”

Explains Sims, “It’s just a peek into my life — like what kind of kid food do I eat, family meals, DIY stuff … It’s everything from food and fashion to beauty.”

“Moms still wanna be cool – even at 43 – and because I have the in with stylists, it’s a good way for people to have access to that through my channel,” adds Sims. “I really love it because it’s the life I’m living.”

— Ale Russian with reporting by Mary Green

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