The marriage occurred at the Kennedy compound at Hyannis Port, Mass., according to the New York Post.
Kennedy, 60, and Hines, 48, reportedly began dating in 2012 and became engaged at the end of April.
The marriage is Kennedy's third and Hines' second.
Kennedy, one of Robert F. and Ethel Kennedy's 11 children, has six of his own children from his previous marriages. Hines, of HBO's "Curb Your Enthusiasm" fame, has one daughter.
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