Tori Spelling and Dean McDermott in March 2012. (Michael Kovac/GETTY IMAGES FOR JOHN VARVATOS)

The “Beverly Hills 90210” actress, author and reality star made the announcement on her Web site: “Dean, Liam, Stella, Hattie, and I are beyond thrilled to announce that another little McDermott is on the way! We feel truly blessed that another angel has found us.”

Spelling gave birth to her third child, a daughter named Hattie, five months ago. The couple have a 5-year-old son, Liam, and a 3-year-old daughter, Stella. She turned her experience parenting her first two children into a 2009 book called “Mommywood.”

The Spelling-McDermott family appears on its own Oxygen reality show, “Tori & Dean: Home Sweet Hollywood.”

View Photo Gallery: Several births and pregnancy announcements from excited parents-to-be helped kick off the new year.