The tennis pro and mom-to-be took to Instagram to share some photos from her idyllic trip.
It looks like Serena Williams is already enjoying her babymoon.
The mother-to-be took to Instagram on Saturday -- just days after revealing that she's 20 weeks pregnant -- to share an uncaptioned snapshot of her view of an tropical beach.
WATCH: Surprise! Serena Williams Announces She's Pregnant in Swimsuit-Clad Snapchat
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."
WATCH: Serena Williams Shows Off Her Curves and Amazing Abs 'Just Because' in Sexy Bikini Pic
After revealing that she was pregnant, Williams' rep told Reuters that the tennis legend will not be competing for the rest of the 2017 season so she can focus on preparing for motherhood. Check out the video below to hear more.