AJ McLean has finally met his long-lost father.

The Backstreet Boys leader opened up to Page Six Monday night at The Grove’s annual tree lighting festival in Los Angeles about his experience while receiving mental health therapy and how it helped him seek out his father, Bob McLean.

Following the conclusion of the boy band’s world tour in May, the 45-year-old vocalist relocated to Scottsdale, Arizona, where he “spent 10 weeks doing an intensive outpatient program for past trauma, PTSD, depression, and anxiety.”

The musician, who has been sober for two years, stated that he needs to “get to the root” of his problem.

Though he refused to discuss the challenges or how he resolved them, the artist said that the event was “the catalyst” that prompted him to contact his father, whom he hadn’t seen since he was three years old.

McLean commented that while his mother, uncle, and other family members had told him about his father, he “wanted to hear it from the horse’s mouth.”

McLean concluded on a humble note, saying, “Hopefully, if I make mistakes, learning from them. I’m not perfect. I don’t want to be perfect. Nobody is.”