Serena Williams. Photo: Greg Wood/AFP.
The photo, captured by US media, shows Williams in a yellow swimsuit with what appears to be a baby bump.
Williams, 35, hasn’t played since beating her sister Venus in the final of the Australian Open in January to clinch a record 23rd Grand Slam singles title.
She cited a knee injury in pulling out of tournaments in Indian Wells and Miami in March.
In December she announced her engagement to Reddit co-founder Alexis Ohanian, first sharing that news on the Reddit social media site.
This is the reaction on Twitter to her post
For more news your way, follow The Citizen on Facebook and Twitter.
