Photo 20/22

Low-Key Glamour on "Saturday Night Live"

Saoirse absolutely killed her stint on "Saturday Night Live" — and so did her fresh-faced makeup.

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Photo 21/22

A Scorching Pink Lip at the 2015 Governors Awards

A nice, matte statement lip works so nicely with an otherwise low-key no-makeup makeup look.

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Photo 22/22

Youthful Glamour at the 2008 Academy Awards

We couldn't make a list of Saoirse Ronan's iconic beauty looks without including her very first Oscars red carpet, could we? From the slicked-back ringlet ponytail to her ultra-subtle age-appropriate makeup, this look is a real winner.

Image via Getty