Lauren Burnham is celebrating one week as a mom of three. Burnham took to Instagram on Friday to share some sweet moments since she and husband, Arie Luyendyk Jr., welcomed their twins, a boy and girl, on June 11. In a YouTube video released Wednesday, the couple announced that they named their son Lux.The name reveal came as Luyendyk and Burnham were getting ready to head home with their son and introduce him to their older daughter, 2-year-old Alessi.