A year after adopting her daughter Laila, Sandra Bullock has more exciting baby news to share!

“[She's] been quietly going through the process of adopting a third child.” a source exclusively tells Life & Style. “She is absolutely overjoyed and loves being a mom so much. She’s always wanted a big family.”

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The Oscar winner also has a six-year-old son named Louis, who she adopted after her divorce from Jesse James.

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Sandra and Louis in 2013.

As for the 52-year-old's boyfriend Bryan Randall, the insider says he's "devoted to Sandra and is so wonderful to her children."

MORE: Sandra Bullock Gushes About Her Two Kids During a Recent Interview

"Sandra definitely plans to marry him," the source adds. "After everything she’s been through, these are all steps in the right direction in her life.”

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