It's a girl ... again! Serena Williams and Alexis Ohanian have glittering gender reveal

FLASHBACK: Williams announced her second pregnancy in May at the Met Gala.

It's a girl ... again! Serena Williams and her husband, Alexis Ohanian, have announced that they're expecting a second daughter.

The power couple recently held a joint baby shower and gender reveal party in front of friends and family, and announced their big news in a video on Williams' YouTube channel on Monday.

"The big REVEAL is now live on YouTube!" Williams wrote on Instagram. "Did you guess right?"

Ohanian and Williams are already the parents of Alexis Olympia Ohanian, Jr., who will turn 6 next month.

Was there an inkling? Maybe so. Williams wore a white crop top and a pink-and-white striped miniskirt for the event.

"I'm obviously Team Pink," she says in the video, "but I'm a little nervous because I don't have a contingency plan if it turns out to be a boy."

Williams' sister, Venus, and father, Richard, were among the attendees at the soiree, which Williams said wasn't a surprise party. The decor included a rainbow-colored balloon arch, a two-tiered pale pink and blue cake, a dunk tank, and a pink and blue balloon wall for photo ops.

"I picked out a lot of stuff," Williams tells the camera. "I didn't pick out everything, but the balloons that you see, and the pink and blue theme, was yours truly."

But Ohanian had one, extravagant contribution. Instead of cutting into the patisserie for a traditional gender reveal, the tech mogul admitted he wanted to "troll" his wife and daughter ... leading to a sparkling surprise that declared, "It's a Girl!"

Watch the full reveal in the video below.

Williams, who retired after the US Open last September, announced her second pregnancy in May at the Met Gala. In her farewell letter to the sport, penned in Vogue, Williams expounded on the couple's desire to have another child.

"We recently got some information from my doctor that put my mind at ease and made me feel that whenever we’re ready, we can add to our family," she wrote.

"... These days, if I have to choose between building my tennis résumé and building my family, I choose the latter."