December 14, 2009 12:45 PM

PRN/PR Photos

It’s a boy for Kourtney Kardashian!

The reality star delivered son Mason Dash Disick on Monday morning, December 14th at Cedars Sinai in Los Angeles, Calif., a source confirms to PEOPLE. The baby boy weighed in at 7 lbs., 6 oz and measured 19.5 inches long.

This is the first child for Kourtney, 30, and boyfriend Scott Disick, who announced the pregnancy in August. Kourtney’s due date was December 23rd.

The birth was first reported by E! News and Life & Style in a joint statement.

Click here to take a look back at Kourtney’s maternity style!

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