ARod's oldest child, a daughter named Natasha, was born on Nov. 18, 2004. She's often referred to by her nickname, Tashi.
To celebrate his daughter turning sweet 16, the dad shared a video filled with photos and clips of Natasha. "To my Tashi, Happy Sweet 16! The perfect age for you, because you are the sweetest, kindest daughter any dad could ever want," he wrote in the caption. "The best part of this crazy year has been getting to spend more time with you and our entire family. I have cherished every second we have spent together. I can't believe how much you've grown and couldn't be prouder of how you continue to shine in everything you do. Your future is so bright. Keep reaching for the stars! Happy Birthday, Natasha, from the luckiest dad in the world. I LOVE YOU!"