The DJ, 41, became a father for the third time in March when King gave birth to their baby boy Pace.
She confirmed the new arrival at the time, but did not name the father and Diplo remained silent.
However, he has now released his good news – sharing a photo of former beauty queen King cradling their baby boy in a sweet Mother’s Day post on Instagram.
Diplo – whose real name is Thomas Pentz – shared a snapshot of King holding their newborn baby with a photo of his ex-girlfriend Kathryn Lockhart with their two sons and a look back at his own mother.
He wrote, “Thank you for giving me life and helping me create it – the three strongest mothers in the world.
“I’m still in the works, but you gave three perfect beautiful boys. I love you all until the moon and back. “
He added that he had not yet met his baby boy because King had given birth during the coronavirus lockout.
Diplo wrote, “So I had a full ass baby during my forties.
“I hesitated to post it because not only did he already have a better haircut than me …
“But also because I haven’t met him since we were separated by a million kilometers and closed borders.
“His name is Pace, he and his mom are super healthy and happy and I will meet them as soon as we turn a corner on this world stop. “
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Diplo is the father of his 10-year-old son Lockett and Lazer, six, with his ex Lockhart.
He recently explained that he had to isolate himself from his boys during the coronavirus pandemic.
The star wrote, “I stay away from home until I get rid of the virus,” he said in mid-March.
“It hurts because I miss them so much that they are what makes me wake up everyday and live and breathe, they are my ultimate joy, but it is my sacrifice to make sure that everyone around of me is safe. “