The 35-year-old athlete and her fiance, Alexis Ohanian, have yet to find out whether they're expecting a baby boy or a baby girl, but the Reddit co-founder recently revealed that they think they have a daughter on the way.
"We have our hunches. She put it really well," he said on Jimmy Kimmel Live. "She won the Australian Open while pregnant. She remarked that she feels it has to be a girl because everything that little baby went through and handled like a champ -- only a woman could be strong enough to take on."