Serena Williams is following behind Demi Moore, Beyonce and a slew of other stars, and bares all with her baby bump on full display.

The pregnant 35-year-old tennis pro covers the August issue of Vanity Fair, wearing nothing but a skin-toned thong and belly chain for photographer Annie Leibovitz, and opens up about how her fiance, Reddit co-founder Alexis Ohanian, and their baby to be.

Now the two are expecting their first child and Williams admits that “it just doesn’t seem real.”

“I don’t know why. Am I having a baby?” she confides. “If you would have told me last year in October or November that I would have a baby, not be pregnant but have a baby, I would have thought you were the biggest liar in the world. This is kind of how I am right now. This is happening sooner than later, and it’s going by so fast.”

She adds, “I don’t know what to do with a baby. I have nothing. . . . I’ve done absolutely nothing for the baby room.”