How does Reese Witherspoon stay so youthful at 46?

Whenever Reese Witherspoon, 46, shares a photo with her daughter Ava Phillippe, 22, fans are quick to comment on how identical they look, despite the 24-year age gap.

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Indeed, the Legally Blonde actress, 46, has barely changed over the years, still looking as fresh-faced today as she did in Cruel Intentions when she was just 22. So how does Reese still look so young?

WATCH: Has Reese Witherspoon had surgery?

Aesthetic doctor Sophie Shotter gave her thoughts on Reese's impossibly youthful looks. "When she was younger, Reese Witherspoon had a fuller face, which she has shed as she's aged," Dr. Sophie notes, before adding: "She's embraced a few lines and wrinkles."

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Indeed, Reese has smile lines at the side of her mouth, which are referred to as accordion lines.

"Due to her facial structure, Reese is prone to a few lines and wrinkles in the accordion lines, but her upper face is wider-eyed than when she was younger, and she has a lovely smooth upper face," Dr. Sophie comments.

reese-ava
reese-ava

Reese Witherspoon and her daughter Ava Phillippe look identical

Reese is known for her heart-shaped face shape and striking jawline. And Dr. Sophie comments this could be where the star has had work done.

WATCH: Reese Witherspoon details her exact nighttime skin routine - and she's glowing

What surgery has Reese Witherspoon had?

reese-witherspoon-filler
reese-witherspoon-filler

Reese Witherspoon looks incredible at 46

"Reese has maintained that lovely poker straight jawline," Dr. Sophie explains. "She's blessed with a strong jawline, but I suspect there may have been some subtle help along the way, through skin-tightening and carefully placed facial fillers."

Surgery or not, Reese looks gorgeous!

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