Witherspoon posted an adorable throwback pic with her mini-me, writing, "Happy 18th Birthday to my sweet girl @avaphillippe ! ?Your kindness, grace, intelligence and humor never cease to amaze me. I love you and your HUGE ❤️ and I feel so lucky that I get to be your mom. ?#proudmom #18"
Phillippe shared a series of photos for his little girl's birthday, tagging each one with a different part of a message that all together read, "Happy birthday, punk. I love you more than any strangers need [to] read, but...you are the coolest....smartest...most beautiful daughter a father could ever have."