August 11, 2015 01:00 PM

Charlize Theron is in a really good place right now.

The Oscar winner, 40, welcomed a baby girl named August in July — the latest addition to her family, which also includes 3½-year-old son Jackson, whom she adopted in 2012.

“She loves being a mom and couldn’t wait to adopt another baby,” a source tells PEOPLE in this week’s issue. “And she’s excited for Jackson to have a baby sister.”

It seems as if baby August and the start of a new month are both signs of a fresh start for Theron, who is quick to embrace the big changes in her life.

Lester Cohen/WireImage

The star’s announcement comes on the heels of her sudden break-up with longtime love Sean Penn and subsequent post-split reunion on the set of their film The Last Face in late July.

As for right now, Theron remains optimistic. “Everything is wonderful,” adds the source.

For more on Charlize Theron’s adoption, pick up the latest issue of PEOPLE, on newsstands Friday.

— Grace Gavilanes

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