April 05, 2012 11:00 AM

Jackson Lee/Splash News Online

Tori Spelling‘s fourth pregnancy may be her best yet — but it was also the most unexpected.

“I was shocked, obviously,” the actress and Craft Wars host, 38, told PEOPLE Tuesday at a party for her new book celebraTORI, hosted by The MOMS and Teleflora at Make Meaning in New York City.

“It was the second biggest shock of my life. The first was when they said [5-month-old] Hattie was a girl when she was born, because we thought she was going to be a boy. And the second was that I was pregnant after my newborn had just turned one month old. We were shocked.”

“I can dispel the old wives’ tale that you can’t get pregnant while you’re breastfeeding,” Spelling, who’s due in September, jokes on Today.

But perhaps she shouldn’t have been so surprised. After all, she and husband Dean McDermott did choose to ignore their doctor’s advice not to have sex until at least six weeks after her Caesarean section.

“You’re going to have to talk to Dean about this,” Spelling says with a laugh, “because when we got out of the hospital, I was like, ‘Specifically, the doctor said to wait six weeks.’ And he was like, ‘They tell everyone that. We didn’t wait that long with Stella [3½]. Or Liam [5].'”

So, why did she give in? “I didn’t want him to think that the sex was going downhill,” she jokes. Pointing to her belly, Spelling adds, “So here you go. Here’s four.”

Still, she has no hard feelings toward Dean, whom Spelling admits she doesn’t give enough credit to.

“As women, we’re so hard on our husbands,” she notes. “I give him so much grief for no reason. He’ll take his motorcycle out for an hour and I’m like, ‘Where were you? Where’d you go?’ And then I’m like, he’s the most kick-ass dad. Talk about a woman doing it all? He’s a man doing it all, and he does it all and with ease. I’m amazed by him every day and I am so lucky.”

— Tim Nudd with reporting by KC Baker

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