Reese Witherspoon and Ryan Phillippe Share Sweet Tributes to Daughter Ava for Her 18th Birthday

The 18-year-old is the latest in celebrity daughters to debut at le Bal des Débutantes.

Happy Birthday Ava Phillippe!

The daughter of Reese Witherspoon and Ryan Phillippe celebrated her 18th birthday on Saturday, and her parents were there to shower their little girl with birthday wishes on social media.

RELATED: Reese Witherspoon Shares Sweet 4th of July Selfie With Look-Alike Daughter Ava

Ava, who is practically her mom's twin, shared a shot of a stack of letters her mom wrote, with the caption, "18 letters that made me cry (hard) today, courtesy of my lovely mother."

18 letters that made me cry (hard) today, courtesy of my lovely mother.

A post shared by Ava Phillippe (@avaphillippe) on Sep 9, 2017 at 9:37am PDT

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"

She also shared a gorgeous current pic of her daughter with the caption, "#18"

#18

A post shared by Reese Witherspoon (@reesewitherspoon) on Sep 9, 2017 at 11:28am PDT

EXCLUSIVE: Ryan Phillippe on Embarrassing His Kids & Daughter Ava Looking Like Reese: 'She Has Her Own Face!'

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."

happy birthday, punk. i love you more than any strangers need read, but...

A post shared by philz (@ryanphillippe) on Sep 9, 2017 at 11:42am PDT

you are the coolest

A post shared by philz (@ryanphillippe) on Sep 9, 2017 at 11:43am PDT

smartest

A post shared by philz (@ryanphillippe) on Sep 9, 2017 at 11:43am PDT

most beautiful daughter a father could ever have

A post shared by philz (@ryanphillippe) on Sep 9, 2017 at 11:44am PDT

and even though you're no longer a child, you'll always be my little girl. happy 18th, princess

A post shared by philz (@ryanphillippe) on Sep 9, 2017 at 11:45am PDT

He concluded the series with, "And even though you're no longer a child, you'll always be my little girl. happy 18th, princess," and shared an adorable Polaroid of Ava from around age two.