Oscar-winner Charlize Theron reportedly has adopted a second child.

Us Weekly said during the weekend it had confirmed TMZ.com's initial report that the "Mad Max: Fury Road" star adopted a girl last month. The newborn, who is African American, is named August.

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TMZ additionally said Theron, who turns 40 on Friday, had worked with an adoption agency for six months. In early 2012, Theron adopted son Jackson, who was born in her native South Africa.

Theron's representative did not respond to Newsday's request for comment.

Theron, who won the Academy Award for best actress for her portrayal of real-life serial killer Aileen Wuornos in "Monster" (2003), spoke with W magazine earlier this year about motherhood, saying, "I look at Jackson and I want to fight harder to stop AIDS and tell stories that shed a light on injustice. I feel like he deserves a better world. . . . I do know that choosing to be a mom in my late 30s has been really great for me. It's given me perspective."

She is among several single actresses who have chosen to adopt, including fellow Oscar winner Sandra Bullock, who adopted son Louis in 2010; Meg Ryan, who adopted a 14-month-old Chinese daughter, Daisy True, in January 2006; Mary-Louise Parker, who adopted daughter Caroline "Ash" Aberash in Ethiopia in 2007; and Edie Falco, who adopted son Anderson in 2005 and daughter Macy in 2008.

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In June, Us Weekly said Theron had ended her engagement with two-time Oscar winner Sean Penn (2003's "Mystic River," 2008's "Milk"), though neither of the stars, who were together about a year-and-a-half, ever confirmed they were engaged. The two reunited professionally last week in South Africa, where leading lady Theron did reshoots on director Penn's upcoming film "The Last Face."