The 59-year-old `Battleship` star spent more than two hours ironing shirts for customers to help launch his sister Elizabeth`s new venture in Northern Ireland. A source told The Sun newspaper: "Everyone did a double take when they they saw Liam ironing. "No one expected to see a huge star like him doing the laundry." Meanwhile, the Catholic-raised actor - whose wife Natasha Richardson died in a skiing accident in 2009 - is considering becoming a Muslim after falling in love with the religion and its rituals during a trip to Istanbul in Turkey. He explained: "The Call to Prayer happens five times a day and for the first week it drives you crazy, and then it just gets into your spirit and it`s the most beautiful, beautiful thing. "There are 4,000 mosques in the city. Some are just stunning and it really makes me think about becoming a Muslim. "I was reared a Catholic but I think every day we ask ourselves, not consciously, what are we doing on this planet? What`s it all about? "I`m constantly reading books on God or the absence of God and atheism."