spelling040312_07_230.jpgTori Spelling gave birth to her fourth child Thursday evening -- a baby boy, Finn Davey McDermott.

The 39-year-old actress/writer/reality star wrote on her website: "We are so excited to announce the birth of the newest member of the McDermott family! Please join us in welcoming Finn Davey McDermott." The baby was born at 5:39 pm and weighed in at 6 pounds, 6 ounces.

He joins siblings Liam, 5, Stella, 4, and Hattie, 10 months (McDermott also has a son, Jack, from a previous marriage.)