The couple excitedly shared the news on Instagram and spilled all the details about welcoming another baby into the world.
Anna shared a cryptic photo of a black box with the words "It's A…" on it, teasing that there is certainly a new little boy or girl on the way.
"We're excited to be in Texas for my sister's gender reveal tomorrow!" Anna captioned the photo along with the hashtag #pinkorblue.
Anna's sister, Priscilla, is married to David Waller. Josh and Anna traveled down south over the weekend to throw a gender reveal party for the couple.
In a video posted to David Waller's Instagram account, the former 19 Kids and Counting stars are seen running around a porch to place the mysterious box in front of the Waller family.
Moments later pink powder rose from the box, confirming that Josh and Anna will soon be aunt and uncle to a niece.
"It's a girl!!!! Congratulations David & Priscilla!" Josh's wife wrote.
What do you think of the shocking baby news? Sound off in the comments!
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