has shared a rare glimpse of her little sister Johannah as the pair celebrated the younger sibling's 18th birthday - almost two decades after she made her debut on the family's series. The 25-year-old Duggar sister, who is the ninth-eldest of Jim Bob and Michelle's 19 children, wrote 'Happy Birthday Johannah!' over a sweet pic of the two posing arm in arm. A subsequent Instagram Story from Joy-Anna revealed Johannah seated at her birthday brunch, with text overlay declaring: 'Celebrating the BIRTHDAY girl!'
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