Junior Championships, completing their set of medals from that event. Following that season, Agosto aged out of juniors. Belbin/Agosto won the 2004 U.S. national title and would go on to repeat four times. At Nationals in 2005, the last year of the 6.0 system, they received straight perfect sixes for presentation in their free dance. Of the 30 6.0s given out in ice dance at U.S. Nationals, Belbin/Agosto have 14 of them. Their total 6.0 count at the U.S. Championships is second only to Michelle Kwan (38). In February 2005, Belbin/Agosto organized and performed in their own figure skating benefit show, Skate Aid for Tsunami Relief, which raised more than $37,000 for Red Cross relief efforts. Belbin/Agosto won the silver medal at the 2005 World Championships. Their silver medal combined with the placement of the other American team earned the United States three spots to the Olympics in ice dance, the first time this had happened since 1984. By a special act of Congress that passed on December 28, 2005, which President Bush signed on New Year's Eve, 2005, Belbin became a naturalized citizen of the US, making her able to compete for the United States at the 2006 Winter Olympics. Belbin/Agosto went on to win the Olympic silver medal in ice dance on February 20, 2006. They were the first American ice dance team since 1976, the first year ice dancing was contested at the Olympics, to win an Olympic medal. Belbin/Agosto began the 2006–2007 season with a free dance called That's Entertainment but arrived at Nationals with a new program to the music of Amelie. They won gold at Nationals, the silver medal at Four Continents, and the bronze at Worlds. In 2007–2008, they won gold medals at both Skate America and Cup of China which qualified them for the Grand Prix Final, where they took the silver medal. They won their 5th national title and then placed 4th at the 2008 Worlds after a fall by Belbin in the compulsory dance. Belbin/Agosto were regular cast members of the Champions on Ice tour from 2004 until COI went out of business following the 2007 season. They were guest stars on part of the 2008 Stars on Ice tour. In April 2008, Belbin/Agosto left Igor Shpilband and began working with the married coaching team of Natalia Linichuk and Gennadi Karponosov at the Ice Works Skating Complex in Aston, Pennsylvania.