And baby makes four!

The Bachelor fan favourites Sean Lowe and Catherine Giudici have taken to Instagram to announce the couple's second pregnancy.

Lowe, 33, published a video to the popular social media app, showing the couple's 16-month-old son Samuel with Giudici. After he asks their son if he can say "baby,"  Samuel adorably mumbles the world before pointing to his mother's stomach.

Giudici, 31, shared a similar post, which included a picture of Samuel on her lap accompanied by her own video where she asks the couple's son if he knows what her baby bump is.

Following Lowe and Giudici's pregnancy announcement, the couple's die-hands fans took to Twitter to join in on the excitement.

Lowe said in an interview with People Magazine, while he believes their second child will be another boy, the couple also plan to adopt in the future.

"But we'll be so happy either way," he said. "Catherine wants five kids. And we want to adopt as well. It's all a learning process!"

"We're not going to find out the gender," Lowe continued. "We didn't with [Samuel] and it's really exciting to be in the hospital and find out. And neither of us are Type A planners, so we're fine with it."

The happy couple met on season 17 of ABC's The Bachelor, where Lowe was the bachelor and Giudici was one of 26 contestants vying for his heart. They got engaged in the March 2013 finale and were married nearly a year later in a televised wedding ceremony on ABC. The pair also appeared together on season six of Marriage Bootcamp: Reality Stars 4 to work through their material issues.

Did you watch Lowe and Giudici's season of The Bachelor?