Tennis icon Serena Williams has a great serve, but all her previous serves pale in comparison to the unintentional epic-serving she just gave feminists.

According to Williams, her status as the top female tennis player alive, perhaps even of all time, means nothing if she lives not by God's decree to be "fruitful and multiply."

After giving birth to her child in September, Serena believes she will become "a real woman."

“I have so much respect for so many women [for giving birth],”Williams told the Herald Sun’s Stellar “I am about to be a real woman now, you know? It’s going to be something incredibly impressive to go through.”

Uh, oh. Feminist outrage alert in 3...2...1...

“What a ridiculous comment! I am not ‘less of a woman’ because I don’t have children,” wrote one Twitter user.

“You don’t have to have children to be ‘a real woman’. How shallow,” said another.

“What stupid comment brainless,” another opined.

Though Williams extolled childbirth and her newfound woman status, she neither diminished nor ignored the challenges she faced.

“I don’t think watching birthing videos helps,” she said. “I actually think it makes it worse. Having a baby, nothing is guaranteed.”

Though she fears it may affect her performance on the tennis court, Williams said she thinks giving birth will give her "more strength" and "a lot more confidence."

“I feel like I will be ready for anything.”

Williams may rethink being "ready for anything" after she gets a load of the gauntlet feminists are about to make her run.