David Walliams is a ''silly'' dad and likes to play imagination games with his son.

The 'Britain's Got Talent' judge has four-year-old Alfred with his ex-wife Lara Stone and he admits when it comes to parenting he loves to be stupid with the youngster and have fun.

Speaking on Australian TV show 'The Project', he said: ''I'm a silly dad, I love being silly. The wonderful thing is you sort of get to re-live your childhood and you get to be silly and muck around and do all kinds of things you'd normally never do. The other day I was pretending to be a cat and was crawling around over the floor and Alfred was riding around on my back and I just thought, 'This is brilliant.' Because you just wouldn't normally get to do that in other sort of scenario.''

Away from his comedy work on shows like 'Little Britain', David is a successful children's author, penning several books including 'Gangsta Granny', 'Mr Stink' and most recently 'Bad Dad'.

However, Alfred is not a fan of his father's tomes and will just say ''no'' if David suggests one of his stories at bedtime.

Instead, the 46-year-old star often reads Dr. Seuss stories to his son, such as 'If I Ran the Zoo, 'The Cat in the Hat' and 'Green Eggs and Ham', like his father Peter Williams did to him when he was growing up.

When asked if Alfred likes his writing, David answered: ''He does not like them at all, if I try to read one of my books to him, he goes, 'No, no, no.' So I don't read my books to him, there are so many other good books out there that I just read him those. I do write picture books for younger kids so I have read him some of them ... You just want to make your kids happy don't you, at the end of the day. And if you make them happy by reading them a story then that's a great thing. I have very fond memories of my father reading to me, he used to read me Dr. Seuss books and I read those to my son and bedtime is a very special thing. I think it's the best part of the day being a parent, feeding them, giving them a bath, putting them in their pyjamas and then reading to them.''