John Luke Robertson, who stars with his family in A&E’s Duck Dynasty, became engaged to his girlfriend Mary Kate McEacharn on Saturday.

John Luke Robertson Engaged

"She. Said. Yes," Robertson captioned a picture of himself on Instagram holding up a sign that reads “Future Mrs. Robertson” while standing alongside his new fiancée McEacharn. In the snap, McEacharn happily shows off her new ring.

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Saturday doubled as Robertson’s 18th birthday. “Happy Birthday to the boy I'm going to marry,” McEacharn captioned the engagement picture Robertson had shared on her own Instagram page.

Robertson family members Rebecca Robertson and Reed Robertson also shared the engagement news on social media. Rebecca captioned a picture of herself with the two, “She said YES