The father is 32-year-old model Gabriel Aubry. The two met while shooting a Versace ad in Los Angeles two years ago.
Berry told Oprah Winfrey on her show last year that playing a mother in her latest movie, "Things We Lost in the Fire," helped convince her that motherhood was for her.
"I think it validated that I was meant to be a mother because every day I dealt with the character as a mother and thinking as a mother," Berry said. "It let me know that I must be a mother."
Berry won the best-actress Oscar for 2001's "Monster's Ball." She also won an Emmy and a Golden Globe for 1999's "Introducing Dorothy Dandridge."
Berry had said she and Aubry don't plan to marry, but feel fully committed to each other.