The 'Changeling' actress - who raises six children with Brad, her partner of four years - has reportedly decided to make their relationship official in a bid to quash rumours they are on the rocks.
A source told Britain's Sunday Mirror newspaper: "Usually it's Brad who wants to talk marriage. But this time it was Angelina. An aide sent them all the clippings about their 'relationship problems' and Angelina said it was probably best if they married and put an end to the speculation. Brad's face lit up, he was thrilled."
The pair are said to be waiting for a break in their schedule, but could tie the knot in the summer.
They are planning a ceremony in New Orleans - where they spent lots of time while Brad, 45, was filming 2009 movie 'The Curious Case of Benjamin Button' - and will involve their children "in a big way".
It was recently claimed Brad - who has previously been married to Jennifer Aniston - had told Angelina, 34, he did not want to have more children with her unless they tied the knot.
A source said at the time: "He definitely wants to get married before they have any more babies. He needs to know Angelina is really committed to him.Â Becoming Mrs. Pitt would give him that answer."
Last week, the couple issued a statement insisting their relationship was strong following rumours they had split.
Marrying Brad would be Angelina's third trip down the aisle - she has previously wed actors Johnny Lee Miller and Billy Bob Thornton.