Alongside a selfie, Williams wrote on Instagram: "My Dearest Baby, You gave me the strength I didn't know I had".
Williams is taking her maternity leave from the sport after announcing her pregnancy last week.
Serena Williams hasn't played tennis professionally since January, but on Monday the pregnant sports star climbed back to the No. 1 spot in the Women's Tennis Association ranking - and celebrated the moment with her baby-to-be.
It has been reported that Williams plans to take a break from tennis for the rest of the year to enjoy motherhood.
OPEC panel recommends 6-month extension of oil output cuts
Prices for natural gas, meanwhile, fell as the EIA reported a larger-than-expected weekly climb in USA supplies of the commodity. The OPEC has already implemented its commitment while non-cartel countries have implemented over half of the agreed upon cuts.
Serena Williams is enjoying an incredible time in her life. On @alexisohanian bday. from the world's oldest number one to the world's youngest number one.
Williams on Monday returned to number one in the women's rankings even though she has not played professionally since cruising to the Australian Open title almost three months ago. I can't wait for you to join the players box next year.
Kerber can reclaim the top ranking by winning two matches in Stuttgart. As her fans calculated, that means Williams won the Australian Open while pregnant with baby number one.
She deleted the post shortly afterwards but her Los Angeles-based publicist Kelly Bush Novak later confirmed that the player, who is engaged to Reddit co-founder Alexis Ohanian, was indeed expecting her first child.
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