Well, isn’t this one unforgettable birthday present!

According to reports, Kourtney Kardashian gave birth to her and Scott Disick’s third baby, a boy, today on son Mason’s fifth birthday!

"The family is freaking out with joy," a source told E! News. "What an amazing coincidence."

Kourtney shared a special message to her son Mason on the same day she gave birth to her third child.

No word on the name just yet, but momager Kris Jenner joked they were calling the little guy Stuart before he made his big debut.

Along with their newborn son and Mason, Kourt and Scott are also proud parents to daughter Penelope, 2.

Covering the December/January issue of ‘Fit Pregnancy,’ the 35-year-old reality star revealed her third child was due this month and also revealed she would not be hiring a nanny to take care of him.

"I'm not getting a baby nurse," she told the mag. "I take two months off and no one is allowed to bother me or talk to me about anything work-related—or maybe three months this time."