Jessica Robertson is delighted by her family's growing dynasty.

In fact, the Duck Dynasty star said she's "thrilled" that her 19-year-old daughter Priscilla Robertson recently gave birth to a baby girl named August with boyfriend Dillon Nash .

"Congratulations Priscilla and Dillon on the arrival of one of God's greatest blessings," Jessica, 44, wrote on Instagram Stories Oct. 9, adding that she and husband Jep Robertson "are all just head over heels in love with this sweet angel baby!"

And learning about Priscilla's pregnancy was quite the surprise for the couple, who are also parents to kids Lily Robertson Stalbaum , 23, Merritt Robertson Metro , 21, River Robertson , 17, and Gus Robertston , 9. As Jessica shared in a July Instagram post , "This isn

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