The Oscar-winning actress welcomed her son on Saturday at Cedars-Sinai Hospital (the same place where Kim Kardashian gave birth to daughter North West).
This is the first child for Halle and husband Olivier Martinez, but Halle does have a 5-year-old daughter (Nahla) from her previous relationship with Gabriel Aubry.
According to People magazine, Nahla has already visited her baby brother and Olivier has not left Halle's side.
The boy's name has not yet been released.
Halle and Olivier tied the knot this summer in France, even though the A-list actress had sworn off another marriage prior to meeting her hubby.
We wish the happy family all the best and we're sure Nahla will be a great big sister!
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Gallery | Stars And Their Kids!