Molly Sims is pregnant with her third child.

Molly Sims

Molly Sims

The 43-year-old actress and her movie producer husband Scott Stuber - who already have kids Brooks, four, and Scarlett, 16 months - were "shocked" to discover they will be adding to their family at the end of the year, but couldn't be happier.

Molly said: "It's a Hail Mary! I'm so happy -- we're so blessed. We were so shocked, but we're thrilled."

The 'Yes Man' actress admitted the pregnancy was unplanned and joked it was the result of "what happens when I go visit my husband on the movie set."

Though Molly was anxious about having another baby later in life, she was reassured when she heard Rolling Stones rocker Sir Mick Jagger, 72, is preparing to be a father again as 29-year-old ballerina Melanie Hamrick is expecting is eighth child.

She told People magazine: "Being 43 is a little worrisome, cause I'm like 'OK, 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."

And the 'Fired Up!' star is having a tough time with morning sickness.

She said: "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.

"I have thrown up in the Bristol Farms parking lot and I have thrown up outside of a restaurant. It's just bad!"

Shortly after giving birth to Scarlett, Molly admitted she was much more confident with her parenting than the first time around.

She said: "I had much more trepidation with Brooks because I didn't know what I was doing. With her, it's like, 'OK, you're pooping, you're eating, you're drinking -- we're good!' In that way, it's been really good."

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