The 26-year-old actress wore an blue, belted Gucci gown to the awards ceremony in Hollywood on Sunday 28 February and solidified herself as our new fashion favourite.
Larson, who began her career as a child star performing comedy sketches on 'The Tonight Show', has since starred in some of our favourite funny movies like '13 Going on 30' and last year's 'Trainwreck' with Amy Schumer.
As the California native looks set to become Hollywood's next big star, we take a look back at her style evolution - from her early breakthrough roles (think the hilarious '21 Jump Street') to her polished red carpet looks today.
Want more Oscars fashion action? Check out every look from the red carpet in our gallery below: