John Luke and Mary Kate Robertson aren’t just growing their family by one — but by two! The ‘Duck Dynasty’ couple shared the exciting news on Instagram on Friday (Oct. 3), posting a sweet family photo that came with a surprise twist.

“Absolutely thrilled to tell y’all we are welcoming TWINS to our family early next year,” the couple wrote in the caption.

The Robertsons’ growing crew is about to get a lot bigger. Twins will bring the family from three children to five — all at once!

This means grandparents Willie and Korie Robertson are going to have a total of 11 grandchildren.

Related: How Exactly Is Willie Robertson Spending Retirement?

The young couple married in 2015 and share three children: John (6), Ella (4) and Wells (2).

In the black-and-white photo they posted, th

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