The Maleficent star, 39, who serves as a U.N. Special Envoy, visited Clarence House Thursday evening where she joined British Foreign Secretary William Hague for a visit with Camilla, Duchess of Cornwall, wife of Prince Charles.
The gathering, minus Jolie's fiancé Brad Pitt, was described by a palace source as informal and friendly as the trio, joined by a few aides, discussed the summit and the campaign to raise awareness about sexual violence.
It is a cause dear to the Duchess, 66, who has visited rape crisis centers across the U.K., where she has talked with rape survivors and been touched by their experiences.
In February last year, she hosted a reception at Clarence House to bring together key decision-makers and supporters to discuss the issue. She has also visited projects for victims of rape and sexual abuse during official trips to South Africa, Papua New Guinea, India, Sri Lanka and Canada.
Jolie, who co-chaired the four-day Global Summit to End Sexual Violence in Conflict, eloquently addressed the gathering, which drew representatives from more than 100 countries, including George Clooney's fiancé Amal Alamuddin, a human rights attorney.
"We are here for all the forgotten, hidden survivors who have been made to feel ashamed or have been abandoned," Jolie said.
"And for the children of rape – we want the whole world to hear their stories and understand that this injustice cannot be tolerated, and that sorrow and compassion are not enough."
Reporting by PHIL BOUCHER and SIMON PERRY