Recovering alcoholic Matt Willis broke down in tears as he confessed to missing his daughter's first crawl.
The Busted rocker knew he needed to clean up his act after his little girl Isabelle's milestone move happened while he was boozing at the pub with "strangers".
Speaking to Giovanna Fletcher on her 'Happy Mum Happy Baby' podcast about Isabelle, who is now 13, Matt - who also has Ace, 11, and Trixie, six, with TV star wife Emma Willis - recalled: "When Isabelle was born, I stayed clean for a while, and then I relapsed again when she was about six months old.
"I kind of, I missed Emma's birthday. She was in Birmingham and I was at, I was doing a TV show at the time.
"It was the wrap party and I had a glass of champagne and I was off to the races that night; I turned up at her parent's house at four in the morning like it was nothing off my head."
"It was the worst.
"The next morning, I knew what I'd done. Emma told me that I missed Isabelle crawling."
Struggling to compose himself, he continued: "You know, she kind of bum shuffled and stuff.
"But I never, she never crawled - and she crawled that night for the first time, and I was in a pub with strangers.
"You know, I missed that, you know; and it really dawned on me that I was a terrible father.
"It kind of - it really hit me. I saw everything, that cycle of s*** repeating, and it hit me like a tonne of bricks."
The 39-year-old musician admits he was "scared" of being at "rock bottom" because a lot of people don't make it out alive.
Recalling begging Emma, 46, for forgiveness, he went on: "Everyone talks about hitting rock bottom and things and I've always been scared of those words because people die at rock bottoms, they're a scary thing to define.
"For me that was a turning point, I ran out of the house, I walked down the road to this pub and I didn't go in, I had some gear in my pocket which I chucked in the bin.
"I bought a Lucozade, I walked back to the house and I got on my knees and I apologised and I said I was so sorry.
"You know, for the first time, I really meant it.
"It wasn't so much about stopping, it was about being a terrible father and losing everything."
He checked into the Priory rehab to be treated for alcohol and later drug abuse and has since turned into an exercise addict.
Matt is set to share his battle with alcoholism in an upcoming documentary for the BBC, ' Matt Willis: Addiction And Me', later this year.