And she's already crediting the kid with winning a Grand Slam title, since Serena won the Australian Open while she was pregnant with A2.

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TMZ.com reports that the delivery wasn't exactly smooth sailing. Serena , 35, revealed that there were "a lot of complications" at the hospital that required her and fiancée Alexis Ohanian to stay there for 6 or 7 days.

The 23-time Grand Slam winner shared a video clip on her Instagram Stories, Facebook and website saying: "Look what we got! A baby girl!"