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Ava Phillippe, Reese Witherspoon Instagram

Instagram

Is that you, Reese Witherspoon

The 39-year-old actress took to Instagram today to share a then-and-now side-by-side shot of daughter Ava Phillippe, whose dad is actor Ryan Phillippe, in honor of her oldest child's 16th birthday. 

"Wow! My sweet girl turns 16 today! I am so blessed to have such a kind, compassionate, brilliant, artistic, all-around wonderful daughter who makes me a better person everyday. I [love] you @avaphillipe," the proud mama captioned the adorable split shot of her little girl. 

Talk about a mini-me alert! At age 16, Phillipe is almost identical to her famous mom (you're not alone if the image had you doing a double take). 

me and my "straight-shooter" ??

A photo posted by Ava Phillippe (@avaphillippe) on

Of course, Witherspoon is no stranger to posting pics of her three children Ava; Deacon Phillippe, 11; and Tennessee Toth, 2 (her son with second husband Jim Toth). 

In fact, she recently vacationed in Rome, Italy, with her daughter over the summer and shared pics of their meet-and-greet with Valentino.

Reese Witherspoon

Carlos Tischler/Rex/REX USA

Witherspoon was just 23 when she gave birth to Ava, whom she welcomed shortly after tying the knot with Ryan Phillippe in June 1999 (the Cruel Intentions co-stars divorced in 2007).  

"I didn't know what I was doing. I was young. It was shocking. When people ask, 'When's the best time to get pregnant?' I say, 'Pick the best day for when your entire life is gonna change.' There's no good time to have your world turned upside down," she joked to Glamour last December. "Seeing my kids for the first time was primal. The ferocity of love you feel for your children when you see them for the first time—but you've known them inside you—is phenomenal."

PHOTOS: Reese's best looks

Ava Phillippe, Reese Witherspoon

Jon Kopaloff/FilmMagic

She added that, before her daughter graduates high school, she hopes to teach Ava "to not be ashamed about any of her experiences. To live life fully, with curiosity and love, and to be brave."

Happy Birthday, Ava! Hope it's a fabulous sweet 16.