Instagram“The Bachelor” couple Arie Luyendyk Jr. and Lauren Burnham’s bundle of joy has arrived! The pair welcomed their fourth child on September 18, but they didn’t share it until now. On Tuesday, Lauren wrote on Instagram, “Welcome to the world Livvy Rowe Luyendyk. On her Instagram Story, Lauren gushed, “Head over heels for our little gal. The news came after Arie revealed that he was undergoing a vasectomy reversal.