Tennis star Serena Williams announces pregnancy

Serena Williams appeared to announce she is pregnant on Wednesday.

Serena Williams has announced she is pregnant. Picture: AFP/Getty Images

The 23-time grand slam singles champion posted a picture showing off a prominent bump on the social media app Snapchat with the caption “20 weeks”.

Williams, who won the Australian Open in January, announced her engagement to Reddit co-founder Alexis Ohanian in December.