Guy Pearce was "quite definite" that he didn't want children, so it "took a while" to understand he has a son.

Guy Pearce never wanted children

Guy Pearce never wanted children

The 'Spy Among Friends' actor was married to Kate Mestitz from 1997 to 2015 and early in their relationship, he told the psychologist he didn't want to be a father, but shortly after they split, he began dating Carice van Houten and the 'Game of Thrones' actress fell pregnant quickly, much to his shock.

He told The Times magazine: “When Kate and I started going out with each other, I said to her, ‘Look, just so you know, I don’t really want kids.’ And she went, ‘Urghh, I never want kids,’ and I went, ‘Oh, great. Good.’

"A big part of why I never wanted to have children was because I helped raise my sister – I have a sister with an intellectual disability – so I felt like I’d done my parenting. For a long time, I definitely knew I was never going to have kids. It was quite definite."

Of his relationship with Carice, he added: "Things changed and we got pregnant quite quickly. Maybe not really planned. Maybe it was a bit of a surprise.”

While the 55-year-old actor is "besotted" with six-year-old son Monte, he admitted he initially couldn't get his head around the idea he was now a father after the tot was born.

He added: “And of course, I am just besotted with my child. I mean, it’s ridiculous, although it took a while for me to actually believe that my child was really my child. It’s a sort of slow turning around of the ship.

"Even though my body was kind of going, ‘You’re my child and I just want to hold you close,’ my brain was going, ‘No, you don’t have a child.’ I was like, ‘Yeah, but I do’. My brain is going, ‘No, you decided years ago you were never going to have a child.’ ”