Kimora Lee Simmons and Djimon Hounsou split up

After five and a half years together, Kimora Lee Simmons and Djimon Hounsou are calling it quits.

"There have been quite a few hurtful rumors circulating. The truth is Djimon and I have been separated for some time. We have remained happy, loving, co-parenting friends and family. We all have much to be thankful for," Simmons posts on Twitter on Wednesday (Nov. 21).  

The couple never married, but they have one child together, 3-year-old Kenzo Lee Hounsou. The pair began dating in 2007 after Simmons separated from her then-husband, Russell Simmons, to whom she was married from 1998 to 2006.  

Simmons has two other children -- Ming, 12, and Aoki, 10 -- with her ex-husband.