Ava, who was born on Sept. 9, 1999, is Witherspoon's oldest child and her first with ex-husband Ryan Phillippe. While Ava has always resembled her mama, she and Witherspoon look scarily alike now that she's a young adult.
After Ava raved about Witherspoon on her birthday in 2019, her mom wrote back on Instagram, "How did I get so lucky to have a daughter like you?"
Witherspoon also got sentimental when she spoke to Ellen DeGeneres in 2019 about sending Ava off to college. "It's weird when your children go away to college. It's hard. I never imagined how it felt for my mom." She added, "I might have gone into her empty room, laid down on her bed, and cried."
On Sept. 11, Witherspoon shared a sweet photo for Ava's 24th birthday, writing, "It's the joy of my life to watch you grow and become the most inspiring, thoughtful, creative, dynamic, funny woman. I have learned so much from being your mom. How lucky is that ??!! I love you to the stars and back!"