Tori Spelling Baby #4, New Boy With Dean McDermott

Reality stars Tori Spelling and her husband Dean McDermott announced the arrival of their fourth child.

The former "90210" actress first delivered the news on Twitter on Thursday, Aug. 30.

"We are so excited to announce the birth of the newest member of the McDermott family!" It's a boy!!!" she wrote.

"We've been blessed with another angel," McDermott tweeted.

Finn Davey is the newest addition to the couple's three other children:  Liam, 5, Stella, 4, and Hattie, 10 months. Dean also has a 13-year-old son named Jack from his first marriage.

The 39-year-old later announced the news on her ediTORIal blog.

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

Finn arrived at 5:39 p.m., weighing 6 pounds, 6 ounces and measuring 20 inches long.

Spelling and McDermott first announced the pregnancy of their fourth child in March.

"Dean Liam, Stella, Hattie and I are beyond thrilled to announce that another little McDermott is on the way!" Spelling posted on her website. "We feel truly blessed that another angel has found us."

Spelling married McDermott a month after divorce from her first husband, Charlie Shanian. McDermott divorced his first wife to marry Spelling.

In addition to a slew of films, the couple have appeared in reality shows documenting their marriage, pregnancies and the birth of their first three children, "Tori & Dean: Inn Love" and "Tori & Dean: Home Sweet Hollywood" on the Oxygen network.