Fans are now well aware of the couple's ability to keep a secret after taking roughly six or seven months to reveal the news they were expecting a new family member.
"Baby Seebohm due September 🍼👶," Ryan shared with his 216,000 followers whilst fiancee Emily made a clever play on words with her caption, writing: "We've had a little bump in the road.👶🏼"
WATCH NOW: Emily Seebohm and Ryan Gallagher reveal they are expecting a baby. Article continues after video.
In the hilarious video that the soon-to-be husband and wife shared, the former reality television groom is seen frolicking around as pretends that he is the one carrying the child, and not Emily.
Rubbing his stomach sentimentally with a cheeky grin on his face, Emily then cradles Ryan in a typical maternity shoot pose.
Soon after, they reverse their positions to a more conventional pose as the video pans to the pair embracing and sharing a few sweet kisses.
After meeting on the set of Channel 10's The Challenge, the couple became fell hard and fast for one another, getting engaged in December 2022 just four months after meeting.
So certain was Emily that Ryan was "the one" that she decided to dump her then-boyfriend upon meeting Ryan.
"We knew by the last week [of filming The Challenge] that we had feelings there," she said.
"Obviously it wasn't a nice call to make, but I told him what was going on and that there was something there with Ryan and I didn't see the point in wasting any more time."
Despite getting engaged on in December 2022, the pair didn't reveal they would soon be getting married until March 2023.
According to Ryan, he popped the question at a dam on his farm just outside the country town of Goulburn, NSW.
"I thought it was the right spot to do it - she loves the horses and she often swims in the dam," he told our sister publication Woman's Day.
"I did get nervous though. The [ring] was making a bit of a bulge in my pocket. So either she knew I was proposing or she just thought I was happy to see her."
In the same interview, Emily said it was an immediate "big yes", calling it a "really special, cute moment."
"It definitely had a Ryan flair to it and it's something I'll cherish forever," she told the publication.
Based on when Emily is due, we can assume she fell pregnant in December, four months after meeting Ryan, and in the same month she publicly revealed her new relationship and became secretly engaged.