It's hardly surprising Saoirse opted for a career as an actress. She got her first taste of A list life early on when, as a baby, she accompanied her actor dad onto the set of The Devil's Own - and ended up being carried around by Hollywood heavyweight Brad Pitt.
Saoirse was born in Ireland on April 12, 1994, to established actor Paul Ronan - star of Veronica Guerin and The Devil's Own - and his wife Monica. She grew up in County Carlow as a normal youngster who devoted much of her time to her beloved border collie Sassy. Fame was just around the corner, however.
Her first acting role came in 2003 when she landed a part in Irish TV series The Clinic. She appeared in four episodes before moving on to another Irish show, Proof, in 2004. It wasn't long before the talented youngster made the transition to the silver screen. She was chosen to play Michelle Pfeiffer's on-screen daughter Izzie in comedy flick I Could Never Be Your Woman, and the same year lensed holiday movie The Christmas Miracle Of Jonathan Toomey.
Her big break came, however, when - aged just 13 she earned the starring role in the big screen adaptation of Ian McEwan's WWII romance novel Atonement. Playing Briony, the youngster whose actions bring so much heartache to her sibling, was a dream come true for Saoirse, who not only got the chance to work with British star James McAvoy, but also with her role model Keira Knightley.
The movie proved a global success, scooping seven leading awards - including two Golden Globes - and garnering an impressive seven Oscar nominations in 2008. It also marked a personal triumph for the young Irish star whose performance was recognised with two best youth performance awards and a best supporting actress Oscar nod.
Becoming the second youngest actor to be nominated for an Academy Award is no mean feat, and if her career to date is anything to go by Saoirse look set to enjoy a glittering future. And casting agents were quick to come a-calling in the wake of her success Atonement success, leading to a full schedule in 2008. She signed up for Death Defying Acts with Catherine Zeta-Jones, family fantasy City Of Ember, and a role alongside an all-star cast including Susan Sarandon, Mark Wahlberg and Rachel Weisz in an adaptation of the novel The Lovely Bones.