"He's a wonderful guy, a very sweet guy," Simmons, 49, told PEOPLE Monday at the New York City premiere of HBO's Life Support. "I want her to be happy no matter what."
Kimora, 31, and Hounsou, 42, have been spotted getting cozy all over Los Angeles recently, having dinner at Mr. Chow, holding hands at Il Sole and kissing at Hollywood hot spot Winston's.
A rep for Hounsou had no comment. Kimora's rep, Keesha Johnson, told PEOPLE Tuesday, "I'm not commenting on it at this point."
Simmons said he's not sure of the pair's romantic status. "I don't know what they're doing, but he's a nice guy," he told PEOPLE. "She'd better be happy. He's one of the sweetest guys in the world."
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"We're best friends and partners," Simmons said Monday. "We have our businesses together and our children and we do everything for our children, no matter what."