Monte, who was born in 2016, changed his famous father's views on parenting.
'I'm absolutely besotted and fascinated by him and [fatherhood]', Pearce told the publication.
The actor began his relationship with 41-year-old Dutch actress and singer Carice in 2015.
Guy announced the birth of the couple's son on Twitter in 2016, writing: 'A cute little package arrived and told us his name's Monte Pearce. We think we're gonna keep him. Placenta smoothie anyone? @caricevhouten.'
Recently, Pearce revealed he struggled with suicidal thoughts following his split from wife of 18 years, Kate Mestitz in 2015.
Speaking to the Herald Sun, the actor admitted he was at his lowest whilst filming overseas in the months that followed his relationship breakdown.
'I had a little period in the middle of 2015 where I was staggering across busy streets in Berlin where I thought, "If I get knocked down by a car, that will be an easy way out,"' he confessed.
'I wasn't wanting that but I think probably like Jeff Buckley when he went swimming in Wolf River that time, "If a current takes me down then so be it."'
Thankfully, the Australian actor was able to get himself back on trach, crediting music for helping to set him on the road to recovery.
'I was literally sitting there for hours at night, drinking, playing chords over and over and crying and crying — it was really pathetic,' he said.
Is Guy's new series of Jack Irish any good? We review it in the latest episode of TV podcast, Binge List.