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Go ahead and add another title to Serena Williams’ collection: Mom.

The tennis star announced via social media on Wednesday that she gave birth to a girl named Alexis Olympia Ohanian Jr.

Williams posted about her baby on Instagram and Twitter accounts and is heard saying in a video, “We had a lot of complications, but look what we’ve got.”

The 35-year-old Williams said in late December that she was engaged to Reddit co-founder Alexis Ohanian.

Williams wrote Wednesday that their daughter was born on Sept. 1 and weighed 6 pounds, 14 ounces. One posting also says about the newborn, “Grand Slam Titles: 1.”

Williams won her 23rd Grand Slam singles championship at the Australian Open in January — while she was pregnant.

She has not competed anywhere since but has said she intends to return to competition by next year’s Australian Open, which starts on Jan. 15, 41/2 months after her baby was born.

A video posted by the couple online says there were "complications" and that Serena and Alexis Olympia were not able to leave the hospital for six or seven days after the baby was born.

As word made the rounds during the U.S. Open that Williams had given birth, Garbine Muguruza — the reigning Wimbledon champion who is ranked No. 1 as of Monday — offered up quite a punchline.

When a reporter told her that Williams gave birth to a daughter, Muguruza responded: “Baby girl? Well, I hope she doesn’t play tennis.”