Brad Pitt was back to work on the zombie-filled set of World War Z in Malta today. He's been in character all week long but took a few extended breaks from the action to show his kids around. Pax visited Brad in Valletta on Wednesday after Shiloh and Zahara stopped by with Angelina Jolie on Tuesday. The well-traveled Jolie-Pitt kids may find themselves visiting museums, toy stores, and playgrounds in the UK later this Summer when the World War Z crew moves to London and Glasgow. Brad's love interest in the apocalyptic flick, Mireille Enos, will join him there for at least one romantic scene involving a kiss.