Cameron announced in an Instagram post that he and girlfriend Viviane Thibes welcomed a baby girl.
"Today my appreciation for Mother's all over the world has reached new heights," the 39-year-old actor captioned a photo of a pregnant Viviane striking a yoga pose.
"Today I took part in a miracle as my baby girl was introduced to the world through a beautiful Amazon warrior... I'm so proud of you @vivianethibes. #iloveyou," he added.
Cameron is the son of Michael and the actor's first wife, Diandra Luker. He discussed his impending fatherhood in an interview with Entertainment Tonight at the premiere of stepmom Catherine Zeta-Jones' movie Cocaine Godmother this month.
"I'm really looking forward to it, and I think it's going to be more inspiration and drive to really try to put a nice life together for my daughter," the star said.
Cameron was released from prison in August 2016 after serving nearly seven years on drug charges. He told People in November that his family is "closer now than ever" following his time in prison.
"In difficult times, we tend to come closer," the actor explained. "My father and I have an amazing relationship. I love spending time with him, and I will spend as much time with him as I can."
Michael is also parent to 17-year-old son Dylan and 14-year-old daughter Carys with Catherine.