The tennis star announced last Wednesday that she and her fiance, Reddit co-founder Alexis Ohanian, are expecting their first child. Williams shared the announcement in a photo on Snapchat that she subsequently deleted from her story. Her rep later confirmed the happy news to ET.
On Thursday, Williams shared a photo of herself, this time rocking athletic gear, looking out over a pristine blue ocean.
The expectant mother captioned the photo with an iconic quote from Spider-Man: "With great power comes great responsibility."