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Charlize Theron

AKM Images / GSI Media

Charlize Theron sure is embracing her new role as a mom!

The 36-year-old Oscar winner headed to the post office Tuesday in L.A. with baby Jackson in tow.

Dressed in black and sporting oversized sunglasses, the first-time mom carried her newly adopted infant son in his car seat, shielding him from the sun with a white blanket covered in red stars.

So has life completely changed for Theron now that she's a mom?

"It's changed a tiny bit," she told Ryan Seacrest on his KIIS FM radio show. "I now travel in a pack."

"Look, it's been amazing the amount of emails and congratulations," she gushed. "Everyone's just been so lovely. So it's been really nice."