John Thomson was left reeling when his wife announced her recent pregnancy - because he was convinced they couldn't conceive after three failed rounds of in-vitro fertilisation (IVF) treatment.
The 24 Hour Party People star's wife Samantha gave birth to Sophia Melody last month (Mar10), a little sister for Olivia, seven.
But Thompson admits the baby news came as a surprise after so much disappointment during continued IVF treatment for his wife.
He tells Britain's Hello! magazine, "I was just bowled over, in total shock. Here was Sam pregnant and with a baby naturally conceived."
Samantha adds, "All I wanted was another baby. If you're lucky enough to have more than one, it feels like a proper family."