The 44-year-old former child star and his longtime girlfriend, Alaina Meyer, 21, have welcomed their son Avery, and the actor took to Instagram on Wednesday, December 4 to share the happy news.
"With full and grateful hearts we welcome our beautiful son into this incredible world," he captioned a shot of the tot holding his parents' hands. "Thank you for all of your love and support."
The couple revealed the baby would be a boy back in May at a gender reveal party.
Johnny, who previously dated his "The Big Bang Theory" co-star Kaley Cuoco, and Alaina went public with their romance on social media in September, 2018.