A lot can happen in nine months! Well, judging by the size of Jill Duggar's beautiful baby bump, that's certainly true!

Duggar and husband Derick Dillard were celebrating their "9 monthiversary" on Saturday, March 21 (nine months to the day since they married, and shared their first kiss, on Saturday, June 21).

And just a few days behind, at 39 weeks and 4 days, Duggar's ever-growing baby bump is living proof of how much difference nine months can make!

Super-excited for the birth of his first child, dad-to-be Dillard shared an adorable picture of his wife (who looked just about ready to pop in a striped skirt and green stretch T-shirt) as they count down the days until they begin their next adventure into parenthood.

Alongside the snap of Duggar holding her now-customary chalkboard, is a picture of a few of the items Dillard's been collecting as he prepares to become a father. In one snap he's holding a "Dad-To-Be" mug, in another, he's wearing a blue T-shirt emblazoned with the words "#newdad."

"Happy 9 monthiversary @jillmdillard !!!" he captioned the pictures. "A LOT has happened since June 21! I am blessed beyond measure and every day is even better with you baby! You're my best friend, and I love you with all my heart! #newlyweds #newdad."

The couple, who recently returned home after a pre-baby vacation in Texas, spent Sunday night, March 22, at home, hosting dinner with family and friends.

Ben Seewald (Jill's sister Jessa Duggar's husband) shared a photo via Instagram of the happy group eating food around the dining table.

Jessa and I are over at Jill and Derick's with some of the fam sharing a meal together! #fellowship

A photo posted by Ben Seewald (@ben_seewald) on Mar 22, 2015 at 5:52pm PDT

"Jessa and I are over at Jill and Derick's with some of the fam sharing a meal together! #fellowship," he wrote.