Wilson posted what appeared to be a simple beach selfie at first glance. But upon closer look, a blurred, bikini-sporting figure stood behind him.
Ciara also posted a photo to her account. It revealed the figure was her, posing on the rocks with her pregnant belly on display.
“Number 3,” the singer captioned the photo.
» RELATED: Watch Russell Wilson, Ciara surprise his mom with new house on Mother's Day
The new bundle of joy comes after Ciara and Wilson welcomed daughter Sienna Princess Wilson in April 2017. Ciara also has 5-year-old son Future Zahir Wilburn, whom she shares with ex-fiancé, Atlanta rapper Future.
On Mother’s Day last year, Wilson made it clear to Ciara that he hoped to expand their family sooner rather than later.
"Happy Mother's Day to the prettiest girl in the world, the sweetest thing, most precious, most loving, kind thoughtful," Wilson said in an Instagram video. "So uh, that third baby? You're such a good mom. ... I was just tryna see … You know I believe in the number three, too."
Now that baby No. 3 is finally on the way, many online have been pouring out with congratulatory messages.
“Congrats and good luck! From a NY Giants fan!” someone commented on Wilson’s photo.
“YES!!!! Congratulations,” commented former “The Real Housewives of Atlanta” star Phaedra Parks on Ciara’s photo. Parks also included a crown emoji in her remark.