Lisa Kudrow’s sense of humour changed when she had her son

She said: “When I became a mother, everything changed. The instant my son arrived, I thought, 'OH, OK, now I get it. Nothing else is ever going to be as important as this.'

“And my outlook on life changed too - one thing that's kind of sad is that a lot of things that I had found funny before just stopped being funny to me then, and there were a lot of things on TV and in the movies that I couldn't watch anymore.

"Any sort of doctor shows with kids ending up in the emergency room, anything that involved children getting hurt. Before, I'd been able to see movies such as 'Sophie's Choice' and 'Schindler's List' - I couldn't even begin to watch them now. I guess I got sensitive!"

The former ‘Friends’ star and her spouse only had one child by choice, which Julian has always been grateful for.

She added to Candis magazine: “"He's really happy about it. Even as a little boy, he was clear about it, 'I do not want a brother or a sister'. Even if you'd see a cute kid and say, 'Oh that's kid's really cute - no. 'I do not want a brother or a sister.'

“And he was very good about coping as an only child - when friends would come over and they'd have brothers or sisters, he was really sweet with them and shared everything, just like he'd learned to do in preschool.

“And then they'd leave and he'd say, 'I do not want a brother or a sister.' And now he's in his 20s and still say, 'I want to thank you because I did not want a brother or a sister."