Actor Tom Arnold and his wife Julie have filed for divorce after 3 1/2 years of marriage. The filing Tuesday in a Los Angeles court cited irreconcilable differences and said a financial settlement would be reached later, publicist Staci Newman said. Arnold, 39, was previously married to comedian and TV star Roseanne. That nearly four-year union ended bitterly and publicly in 1994. A year later, he married Julie Lynne Champnella, now 25, in Dearborn, Mich. It was her first marriage. The couple have no children.