updated 04/13/2012 AT 5:00 PM ET
•originally published 04/13/2012 AT 3:45 PM ET
“Yes, it’s confirmed,” Pitt’s manager Cynthia Pett-Dante tells PEOPLE. “It is a promise for the future and their kids are very happy. There s no date set at this time.”
Jeweler Robert Procop designed Jolie’s engagement ring in collaboration with Pitt.
Jolie, 36, and Pitt, 48, have been together since 2005, and rumors that they planned to marry have circulated for years.