updated 03/15/2012 AT 10:00 AM ET
•originally published 03/15/2012 AT 8:00 AM ET
Good things come to those who wait, as Charlize Theron has learned.
Following Wednesday’s news that Theron has adopted a son, a source tells PEOPLE that the 2004 Oscar winner “has been trying to adopt a baby for a long time.”
The Young Adult star, 36, “has been very patient and has a great attitude,” the source says. “[She] is ecstatic about finally becoming a mom.”