REYKJAVIK, Iceland — Icelandic Prime Minister Johanna Sigurdardottir has married her long-term partner, her office said on Monday, making her the world's first national leader with a same-sex spouse. Sigurdardottir, 67, married writer Jonina Leosdottir on Sunday, the day a new law took effect defining marriage as a union between two consenting adults regardless of sex. The two had had a civil union for years and changed this into a marriage under the new law, which was approved by parliament earlier this month.