At the event, which was held at the Empire Leicester Square, the actress, 37, wore an Yves Saint Laurent’s black dress.
“I’m very excited for Brad. And it’s a very fun film and my boys are around tonight so they’re enjoying it,” she told reporters.
“He’s been extraordinary, just extraordinary. He’s such a wonderful man and a wonderful father. I’m very, very lucky,” she added.
Jolie announced that she has made a double mastectomy in an article published in The New York Times last month, in which she said she took the decision after discovering that she was a carrier of a gene that increases the risk of developing breast cancer by 87%.