Article continues below advertisementThe Robertson family from Duck Dynasty is preparing to welcome a new addition!Priscilla Robertson, the daughter of Jessica and Jep Robertson - one of the late Phil Robertson's five adult children - is expecting a baby. Jessica unveiled her 18-year-old daughter's pregnancy on Sunday, July 20, sharing four delightful photos of Priscilla proudly displaying her growing baby bump."Me & Jep are excited to welcome another new grandbaby in October. Priscilla will give birth to our granddaughter & we are blessed to add another grandbaby," Jessica wrote.