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Jason Wahler, Ashley Slack, Ashley Wahler

John M. Heller/Getty Images

Jason Wahler just came clean—he's going to be a dad!

The Laguna Beach alum and his wife of four years, Ashley Slack, are expecting their first child together set to arrive in August. Slack announced the happy news on Instagram with a photo of a sonogram and a baby onesie and matching hat.

"LOVE + MARRIAGE = BABY," she captioned the sweet photo. "#werehavingababy #happiness #love #soexcited #august #2017thebestyearyet #babywahler." Wahler reposted the photo, writing, "So blessed!"

Ashley tells E! News: "Jason and I are so thrilled to be starting our own family and making traditions together! This baby is such a blessing to us and we can not wait to see what he or she will look like! We are both really looking forward to spending all of our first holidays with a new baby and creating so many new memories along the way!"

The couple wed in October 2013 in Malibu, Calif. after nearly a year-long engagement. 

Jason Wahler, Baby Announcement, Pregnancy, Ashley Slack

Instagram

Meanwhile, the timing of the pregnancy falls simultaneously with his Hills ex Lauren Conrad and co-star Whitney Port, who are both also pregnant with their first babies. 

"Oh hey! Just standing by the window in my underwear, with a BABY in my belly!!!" Port quipped in her own announcement on social media. "DM me if you know what I'm supposed to do with this thing for how ever many years I'm supposed to be in charge."

Conrad shared the exciting news on New Year's Day with a single shot of her sonogram. 

"I have a feeling 2017 is going to be the best year yet..." she teased at the time. 

We're sure Wahler would say the same!

Entertainment Tonight was the first to report the happy news.