Pharrell Williams has custom-made 'Spongebob Squarepants' socks.

The 'Happy' hitmaker is a big fan of the yellow cartoon character and spin-off merchandise, and found a pair of toe socks so comfortable, he decided to have some more made, but in a more luxurious material.

He admitted: ''I love 'Spongebob Squarepants' toe socks so much that I had a cashmere pair made.''

And Spongebob isn't the only cartoon character the 36-year-old star likes.

He said: ''I wear Mickey Mouse slippers around the house.''

Pharrell is fascinated by outer space, and though his clothes have made it into orbit, he has no desire to leave earth himself.

In an interview with Us Weekly magazine, he said: ''[Astronaut] Leland Melvin took one of my Billionaire Boys Club T-shirts to space.

''I love [late astronomer] Carl Sagan and respect outer space so much, but in reality I wouldn't ever go there!''

However, one place he is keen to spend more time in is Japan.

He admitted: ''I love Japanese food, especially the truffle yellowtail at Pubbelly Sushi in Miami Beach.

''I could live in Tokyo one day - I love that city.''