Kimora Lee Simmons & Djimon Hounsou Split

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Though never married, Djimon Hounsou and Kimora Lee Simmons are ending their relationship, according to

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Hounsou's rep tells the news source that the couple has "officially separated after 5 1/2 years."

The actor, 48, reportedly met Simmons, 42, in February 2007 after her split from hip hop mogul Russell Simmons.

They have one child together, three-year-old son Kenzo Lee Hounsou.