Jennifer Lopez shared a touching tribute to her two children, twins Emme and Max Muniz, on their 18th birthdays. Lopez, 56, who shares Emme and Max with ex-husband Marc Anthony, took to Instagram on Sunday, February 22, to celebrate the milestone through words and a video filled with photos and footage. "You were born in the middle of the night, in the midst of the biggest, most beautiful snowstorm NY had seen in years!!" Lopez began.