Back in September, the internet was buzzing about Jessica Simpson putting the planning of her wedding to former NFL player Eric Johnson on hold. Well, this week that news made sense when the 31-year-old singer and fashion designer confirmed to the media and her fans that she and Johnson were expecting the arrival of the first baby together.

"They're really excited," a source tells PEOPLE of the pregnancy. "It wasn't something they planned per se, but it's also not something they were trying to avoid. They're both very family-oriented and having a baby is something they both wanted. It's wonderful!"

With priorities shifting from wedding planning to planning for their new arrival, Simpson is supposedly putting her nuptials with Johnson on the back burner until the little one is born.

"They're both still really committed to getting married, and were both really into making decisions about what kind of wedding they wanted," continues the source, who reveals they had originally planned to tie the knot this month. "It's just going to be at a later date now [because] they really want to enjoy this time in their lives."

The baby on the way is the first for both Simpson and Johnson, who became engaged last November.