The best actress nominee also had the best reason behind her choice of red carpet attire - Ronan told E! News that the shimmering green dress was a tribute to her Irish heritage (though born in The Bronx, both her parents are from Ireland).
See her dazzling Academy Awards appearance below:
Saoirse Ronan Oscar 2016 (list)
Want more Oscars fashion action? Check out every look from the red carpet in our gallery: