Brad Pitt has joined former U.S. President Jimmy Carter to help volunteers from a Christian charity build homes for the poor in western India, the organization said. Each year since 1984 Carter and his wife Rosalynn have spent a week building homes for the organization around the world and promoting its work. This week they were also joined by former Australian cricket captain Steve Waugh among others.Pitt, wearing a white shirt, dark jeans, goggles and a baseball cap, fixing a window grill with gloved hands. Another showed him intently slapping cement on bricks.Pitt spent about half an hour working under the hot sun and talking to volunteers, newspaper reports said.