06/29/2012 at 12:00 PM EDT
Short for summer!
has kept her buzz cut under wraps
until now, finally debuting her new look this week.
The new mom
still looks gorgeous, bald and beaming while holding her infant son, Jackson
It's a far cry from the long locks Theron, 36, sported as the Evil Queen in Snow White and the Huntsman
, but the short style is not merely to beat the heat.
The actress brought out the razor for her new role as Furiosa
in Mad Max: Fury Road
, which she's currently filming in Namibia. – Liz Raftery