The 39-year-old Oscar winner posted the split of Ava as a child and as a teenager in honor of Ava's birthday on Sept. 9.
"Wow! My sweet girl turns 16 today!" Reese wrote. "I am so blessed to have such a kind, compassionate, brilliant, artistic, all-around wonderful daughter who makes me a better person every day. I love you, @avaphillippe."
Ava is the eldest of Reese and ex-husband Ryan Phillippe's two children. They also share a son, Deacon, 11.
The lookalike mother-daughter duo have been posting several cute pics of them together lately. In one taken ahead of the Hot Pursuit premiere in April, Ava is seen rocking blue hair and a white lace dress.