Duck Dynasty stars Willie and Korie Robertson just became grandparents for the eighth time over, and this time around, it’s a Halloween baby. The couple’s daughter Rebecca Robertson and her husband John Reed Loflin welcomed their third child on Thursday (Oct. 30), a baby boy named Xander Reed. After soaking up the happy news privately for a few days, Rebecca announced the baby’s birth on social media on Saturday (Nov. 2), writing that his arrival on Halloween Eve was “perfectly fitting for our family. “We’re already so smitten with our little boo!” she added. Along with the birth announcement,…