Jessa Duggar says she's "super excited" about her sister Joy-Anna Duggar's engagement.
"Hey Joy and Austin, congratulations!" Seewald began before Duggar added, "We're super excited for y'all getting engaged, and we're looking forward to the big day -- your wedding day.
"The little boys say congratulations, too. Here's Henry and Spurgey saying, 'Yay! We're happy to have another uncle!' Love y'all," she said.
Joy-Anna and Forsyth got engaged last week after announcing their courtship in November.
The star hails from a conservative Baptist family, and will share her first kiss with Forsyth on their wedding day.
"We get to hold hands now, so that's really special," she recently told People.
"I feel like engagement is more special because we're committed to each other now, and we're just moving forward to the day that we get married, and it's exciting," Forsyth added.
Jessa herself married Seewald in November 2014 after more than a year of dating, and most recently welcomed Henry in February.
She and her family came to fame on the TLC series "19 Kids & Counting," and presently star on "Counting On."