Saoirse Ronan

Ronan earned an Oscar nomination at age 13 for her breakthrough role as the nosy young playwright in 2007's 'Atonement.' Her net worth has been reported at $2.5 million, which seems low for an actress who had starring roles in 'The Lovely Bones' and 'Hanna.' The worldwide success of that assassin thriller, along with the four movies she has coming out over the next year or so (including one from 'Twilight' author Stephenie Meyer), should make the 17-year-old Irish actress more in demand.