Kourtney Kardashian has a new family member she'll need to keep up with.

The Keeping Up With the Kardashians and Kourtney and Khloe Take Miami star and her boyfriend Scott Disick welcomed their first child -- a baby boy -- on Monday morning, E! News reported.

Mason Dash Disick -- whose middle name is a reference to the Kardashian sisters' Dash boutique -- was born in a Los Angeles-area hospital weighing 7 lbs., 6 ounces and measuring 19.5 inches.

"Kourtney just delivered a healthy baby boy about an hour ago," her publicist told E! News on Monday morning.

Kardashian announced she was pregnant in August and the family threw her a baby shower last month at Kris and Bruce Jenner's house in Calabasas.

On Thursday, Khloe and Kim Kardashian told Ryan Seacrest on his KISS-FM radio show that their sister was "due any minute."

Keeping Up With the Kardashians' fourth season premiered last night on E! and featured Kourtney's family members -- especially Kris and Khloe -- vocally expressing their concern about Disick becoming a part of the family as the father of her baby.