Although, Reedus admitted it was a "little harder" for Mingus when he was younger."When Mingus was smaller, it was a little harder, going from two places," he told the newspaper back in 2014.
He has been nominated for three Academy Awards and has won the Golden Globe and Screen Actors Guild Awards for Best Actor.
They began dating right after Diane split from her husband of five years, French director Guillaume Canet.
The two were last spotted together in February at the opening of Joshua’s Broadway play, star Norman Reedus in dive bar in New York.
However, the "Walking Dead" star has never been shy to gush about his teen boy.
Last year, the 47-year-old dad revealed that Mingus had the opportunity to follow in his acting footsteps, but turned it down.
Here’s what he looks like now: Happy birthday to the love and joy of my life.Just check out this adorable snap of the father-son duo.Reedus and Christensen try to keep their son out of the limelight, which is why photos of Mingus are scarce on both their social media pages.The actor and model dated from 1998 to 2003 after meeting through photographer Yelena Yemchuk.“I guess Helena saw a picture of me and said, ‘Who’s that? It has been reported — but not confirmed — that she is pregnant with Reedus’ child.star and the former Victoria’s Secret Angel attended their 18-year-old son’s high school graduation together and proudly showed off photos on Instagram.Christensen, 49, looked happy posing alongside her ex and their son, Mingus.The proud papa posted a picture from graduation day on Instagram and gave his ex a little shout-out."Props to this lovely lady," star wrote on Tuesday, "(he graduated!!)."The model also shared a series of shots from the big day, including one of her sitting next to her ex.A group of onlookers had claimed she was sitting on Norman’s lap and kissing him in a dark corner of 12th Street Alehouse in the East Village.Norman dated and has a child with supermodel Helena Christensen. At the time, Joshua was in The Philippines filming the documentary series for National Geographic.