Entertainment Tonight ET Online ETOnline.com

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

PICS: The 10 Most Shocking Breakups in Hollywood

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.