October 05, 2016 08:00 AM

Ari Michelson

And baby makes seven: Tori Spelling is expanding her family once again.

“It was a total surprise,” Spelling tells PEOPLE exclusively in this week’s issue of her impending fifth child with husband Dean McDermott. “But we always wanted a big family. I’m really excited.”

The pair are already parents to Liam, 9, Stella, 8, Hattie, 5 and Finn, 4. Dean also has an 18-year-old son, Jack, from his previous marriage.

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“Dean was saying, ‘We just got Finn out of diapers; I thought we were in the clear!’ ” says Spelling, 43, with a laugh. “For the first time this year, they’re all in school. So it’s like, wow. We’re basically starting over.”

Ari Michelson

Regardless of the inevitable adjustments — “We need a Sprinter van!” says McDermott, 49 — the couple, who recently celebrated their 10-year anniversary, say baby number five is definitely meant to be.

Watch this full episode of People Features: Tori & Dean, available now, on the new People/Entertainment Weekly Network (PEN). Go to PEOPLE.com/PEN, or download the PEN app on Apple TV, Roku Players, Amazon Fire TV, Xumo, Chromecast, iOS and Android devices.

RELATED VIDEO: Story Behind the Story: Tori Spelling Becomes a Mom for the Fifth Time

“This baby happened at the best time,” says Spelling. “Nothing is ever perfect, but I’m so madly in love with my husband and with our kids. The idea of adding to that is such a blessing.”

For exclusive photos and much more from Tori and Dean, pick up the new issue of PEOPLE, on newsstands Friday.

— Aili Nahas

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