Tori Spelling and Dean McDermott Welcome Baby No. 5!

The happy couple's family just got a little bigger with the addition of an adorable baby boy.

Tori Spelling and husband Dean McDermott are new parents yet again!

The couple welcomed their fifth child, son Beau Dean McDermott, on Thursday.

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Spelling announced the news on Twitter with a photo of their newborn holding her finger, which she captioned, "We are so excited to announce the birth of the newest member of the McDermott family!"

WATCH: Tori Spelling Talks Her Health During Fifth Pregnancy

Beau was born weighing 5 lbs., 12 oz, and came in at 18.5 inches long, People reports.

The couple, who announced that they were expecting back in October, already have two sons and two daughters together -- Liam, 9, Stella, 8, Hattie, 5, and Finn, 4.

In December, the couple had a surprise gender reveal party, where they came home to find their Christmas tree decked out in blue ornaments.

WATCH: Tori Spelling Announces Sex of Baby No. 5 in Surprise Gender Reveal -- See the Pic!

Spelling told ET in October that their children were very eager to discover the sex of forthcoming addition to their family.

"We have two of each, so we're blessed," she said. "We did find out with the first two, didn't find out with the second two -- huge, amazing surprises. The kids are old enough now they kind of want to find out."

Check out the video below to hear more about the couple's new bundle of joy.