Tori Spelling, Dean McDermott

The Spelling/McDermott family has a new addition!

Tori Spelling gave birth to a baby boy, Finn Davey McDermott, early Thursday evening — her fourth child with husband Dean McDermott.

Finn weighed 6 lbs., 6 oz. and was 20 inches long when he was born, Spelling wrote on her website.

Tori Spelling admits recent pregnancy was a surprise

"We are so excited to announce the birth of the newest member of the McDermott family!" Spelling wrote. "Please join us in welcoming Finn Davey McDermott."

The pregnancy was unplanned, with Spelling finding out she was expecting again just five months after giving birth to her daughter Hattie last October.

Finn joins siblings Liam, 5, Stella, 4, and Hattie, 10 months.