Brad lets his hair down with U2 boys

Brad Pitt spent a week partying to get over a "stressful few months".

The 49-year-old actor has been under a lot of strain following his fiancée Angelina Jolie's double mastectomy surgery and promotional duties for his new film 'World War Z', and was given a reprieve to enjoy a holiday with his male friends in Europe by the 'Salt' actress.