The tennis great and her husband, Alexis Ohanian, also have a five-year-old daughter.
"For the love of God, stop burning things down to tell everyone about your kid's penis," wrote Jenna Karvunidis.
If we don’t want pink and blue stereotypes as our kids grow up – why do we want them before birth?
It represented more than just a party to me.
Queensland Police have released the footage in a bid to deter similar stunts.
Gender reveal stunts and parties are growing in popularity, where parents-to-be surprise friends and family by revealing the gender of their baby. While normally limited to balloons or cake, "burnouts," where cars give off pink or blue smoke, have become popular in Australia. But a recent stunt near the Gold Coast ended with a car bursting into flames and the owner was later convicted of dangerous operation of a motor vehicle.
The restaurant chain has 250 locations – but sadly not in the UK.
It’s time to enter the 'Upside Down'.