The couple, who got engaged on The Bachelor: After the Final Rose in March 2018 and tied the knot in Hawaii in January 2019, enjoyed a big celebration at their home in Arizona ahead of their daughter's June due date and captured some special moments from the day on their respective Instagram Stories.
Lauren, 27, reportedly shared a photo of her getting an ultrasound in the middle of her living room as girlfriends surrounded her and Arie watched with his wife.
Lauren also posted a photo of Arie, 37, cradling her baby bump with the following caption: "This little babe is loved."
The party featured a spread of desserts such as waffles and fruit, as well as games including a bottle-chugging contest for the men. Lauren reportedly joked in a video that Arie cheated to win.
Lauren wore a beautiful white lace dress for the occasion, while Arie sported a pink button-down shirt and white pants.
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In one hilarious photo, the couple was gifted a onesie with a glittery rose on it that read, "Can I steal Daddy for a sec?!" -- an obvious reference to how women competed for Arie's time and affection on The Bachelor's 22nd season last year, especially on Night 1 and during group dates.
Lauren wrote on the image, "I was mid sentence saying, 'Absolutely not.' Guess I still have a little PTSD," according to People.
Arie and Lauren -- who just recently spoiled themselves with a babymoon in Bermuda -- announced they're expecting their first child together in November 2018.
Two months later, the couple revealed they have a baby girl on the way, and Lauren has been sharing the progress of her baby's development and her bodily changes ever since.
Lauren previously revealed to Entertainment Tonight that she and Arie have a very special name picked out for their baby girl when she arrives.
"It was a name that we kind of tweaked into something unique," Lauren told ET, adding that the pair had decided on the name during the Christmas holiday. "We don't really know anybody who's named that."