Saoirse has been one of the most outspoken actress regarding Hollywood's anti-harassment movement.
The visibly overjoyed star took the stage with a message of gratitude to those who supported her along the way. "I think it's also not just the content of what she says, but the way she delivers something is so inspiring that she had everyone on board".
The top Golden Globes prize is merely the latest accolade for Lady Bird, which has been named best picture by a number of critics groups, including the National Society of Film Critics, which just voted on its annual awards on Saturday.
"So happy birthday, mum - even though I think she wanted Lady Bird to win!"More news: United Nations emergency session humiliating defeat for US
She was previously nominated in best actress category for the movie "Brooklyn", and was a supporting nominee for her breakout role in "Atonement".
It has been a great night for the Irish at the Golden Globe Awards in Beverly Hills, with Lady Bird star Saoirse Ronan and Three Billboards Outside Ebbing, Missouri, writer-director Martin McDonagh among the winners. The actress is up for Best Performance by an Actress in a Motion Picture - Musical or Comedy.
Tonight, Ronan bested in the category Margot Robbie (I, Tonya), Judi Dench (Victoria & Abdul), Emma Stone (Battle of the Sexes) and Helen Mirren (The Leisure Seeker).
HollywoodLifers, what did you think of Saoirse's dress at the Golden Globes?