Los Angeles - Charlize Theron is getting ready to adopt a second child.
The Monster star is keen for her son, Jackson, two, to have a sibling, and will be starting the process in the New Year.
A source told National Enquirer magazine: "Charlize admits it's a lot to go through, but she definitely wants Jackson to have a little brother. She's starting the process all over again right after the New Year. She wants Jackson to have a sibling who isn't four or five years younger than him - she wants to raise them together."
The South Africa-born actress has not yet decided which country to adopt the child from or whether he or she will share Jackson's African-American heritage.
The source added: "She's made no decision about that yet. She is eyeing the possibility of adopting a child from South Africa this time, but she hasn't decided. She just knows she wants another baby."
Charlize - who split with long term partner Stuart Townsend after nine years together in 2010 - became mother to Jackson in 2012 and claims she always knew she would adopt.
She said at the time: "My mother found a letter I wrote. It said, 'Would you please take me to orphanage, so that I can go and adopt a baby?' I always knew I would adopt. Always."
Speaking of being a single parent, she added: "You know, I don't think any mother aims to be a single mom. I didn't wish for that, but it happened."