Mori was crowned Miss Universe on May 28, 2007, by the outgoing titleholder Zuleyka Rivera.
As Japan’s representative in the Miss Universe 2007 pageant, Mori travelled to Mexico City, Mexico in early May to participate in four weeks of events, rehearsals and preliminary competitions with the other seventy-seven delegates.
In the final competition, broadcast internationally on May 28, 2007, Mori was announced as one of fifteen semi-finalists who would move forward to compete for the title. She achieved the highest score in the swimsuit competition, which advanced her to the top ten and the evening gown competition, in which she placed fourth. Mori’s kimono-inspired black/floral evening gown of choice came from the Spring/Summer 2007 collection of Gucci.
In the last round, Mori was asked by Elle magazine fashion director and Project Runway judge Nina Garcia to speak about the one lesson she learned as a child that still affects her life. Mori said that since childhood she has been dancing and hence she was constantly surrounded by students and teachers. Due to the interactions with them, she has learned to become always happy, patient, and positive in her life. She also expressed a desire to teach these principles to the next generation.
At the conclusion of the competition, she was crowned Miss Universe, becoming the second woman from Japan to hold the title. The first Miss Universe winner from Japan was Akiko Kojima in 1959. Mori is the eleventh Asian woman to win the pageant.
Mori was the third Japanese woman to place in the top five at Miss Universe in the past decade. Miyako Miyazaki placed fourth runner-up at Miss Universe 2003, and Mori’s predecessor Kurara Chibana was first runner-up in 2006. Mori aims to use her success and poplarity as a springboard into humanitarian causes. “I think I have a samurai soul, I’m very patient, and I can serve others.” As of May 2008, Mori had traveled to Indonesia, Spain, the Bahamas, St. Kitts and Nevis, China, Mexico, Canada, Germany, Vietnam, France, Monaco, San Marino, Russia and Italy in addition to numerous trips and her homecoming in Japan. She also visited numerous cities in the United States.(from wikipedia)
Mori crowned her successor, Venezuela native Dayana Mendoza with a $120,000-USD tiara, Miss Universe 2008 on July 14, 2008 in Nha Trang, Vietnam.