Angelina Jolie made her first public appearance since she announced last month that she had a double mastectomy and was seen with her husband Brad Pitt at the premiere of the film World War Z on Saturday. 

The couple both wore black outfits and signed autographs for fans in London's Leicester Square.

In World War Z, Pitt stars as United Nations employee Gerry Lane who travels the world in a race against time to stop the Zombie pandemic that is overthrowing armies and governments, and threatening to destroy the human race.

Others in the cast include Mireille Enos of the AMC series The Killing, David Morse, Eric West and Trevor White. 

The 37-year-old actress announced in an op-ed article in The New York Times May 14 she underwent a preventive double mastectomy after she learned that she carries a mutation of the BRCA1 gene, which greatly increases her risk of developing breast cancer and ovarian cancer. Doctors estimated she had an 87 percent risk of breast cancer and a 50 percent risk of ovarian cancer. 

"Once I knew that this was my reality, I decided to be proactive and to minimize the risk as much I could. I made a decision to have a preventive double mastectomy," the actress wrote.

Jolie's mother, actress and producer Marcheline Bertrand, died of ovarian cancer in 2007 at the age of 56.

In the Times op-ed, titled My Medical Choice, Jolie wrote she finished three months of medical procedures at the Pink Lotus Breast Center in California on April 27 that included the mastectomies and reconstruction.

View photos of Jolie at the premiere here.

World War Z opens in theaters June 21.

Tags: Angelina Jolie Brad Pitt World War Z