08/30/2012 at 11:00 PM EDT
has a new man in her life – her newborn son.
On Thursday night, the actress announced the birth of her fourth child with husband Dean McDermott, writing on her website
, "We are so excited to announce the birth of the newest member of the McDermott family!"
Finn Davey McDermott was born Thursday at 5:39 p.m. He weighed in at 6 lbs., 6 oz., and was 20-inches long.
Spelling, 39, and McDermott, 45, are already parents to Liam, 5, Stella, 4, and Hattie, 10 months.
Spelling announced her pregnancy
just five months after giving birth to daughter Hattie.
“I was shocked, obviously,” Spelling told PEOPLE of getting pregnant so soon after giving birth.
But she was also pleased to expand her family even more. When she announced her latest pregnancy, she said, "We feel truly blessed that another little angel has found us."