Maria Shriver cheated on  Arnold Schwarzenegger with his own campaign strategist - flaunting the relationship in front of staffers five years before her husband's affair with the family maid was exposed, a shocking new report claims. Shriver debuted boyfriend Matthew Dowd last month at her cousin Bobby Kennedy Jr.'s wedding - introducing him to the family at the Kennedy Compound in Hyannis Port, Massachusetts. According to initial reports, the two have been seeing each other for less than a year. However, the New York Post now claims that Shriver and Dowd started their relationship in 2006 when Dowd was a chief strategist for Schwarzenegger's gubernatorial reelection campaign. Schwarzenegger found out, but she continued the relationship anyway, according to the newspaper.
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Maria Shriver introduced her  boyfriend Matthew Dowd to her family at cousin Bobby Kennedy's Jr.'s wedding
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The New York Post claims that Shriver started seeing Dowd in 2006 when he was a top campaign adviser to her husband Arnold Schwarzenegger
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Shriver and Dowd continued their relationship after the election campaign, the newspaper claims
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Dowd was a key adviser on George W. Bush's 2000 and 2004 election campaigns - but later split with the president over the Iraq War
The couple are seen here at @placeholder's swear-in in 2007