Michael's son Cameron Douglas and girlfriend Viviane Thibes officially welcomed a baby girl on Monday, December 18.
The couple confirmed the news with a sweet Instagram post.
Cameron captioned the photo with: 'Today my appreciation for Mother’s all over the world has reached new heights...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'
The happy news comes just 16 months after Cameron was released from a seven-year prison sentence. The star was originally sentenced to five years in prison in 2010 for possession of heroin and selling methamphetamine but was later extended after confessing to sneaking drugs into prison.
Despite his troubled past causing friction between him and dad, Michael he told PEOPLE: ' 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 also originally shared his excitement over becoming grandparents with Catherine Zeta-Jones to Entertainment Tonight. The 73-year-old star said: 'I'm going to be a grandfather this month, before the end of the year. I’m very excited. It’s about time'.