Gay fashion designer Karl Lagerfeld has lashed out at another celebrity who doesn't fit his limited view of beauty, but this time it's the Duchess of Cambridge's sister Pippa Middleton.

The German artist, famed as head designer and creative director for the fashion house Chanel, said he doesn't like the 28-year-old's face.

Pippa's bottom caught the world's attention when she was bridesmaid at Kate Middleton's royal wedding to Prince William in 2011 and the Lagerfeld added that she should 'only show her back' because she 'struggles' with her looks.

'Kate Middleton has a nice silhouette and she is the right girl for that boy,' the 78-year-old said, reported The Telegraph.

'I like that kind of woman, I like romantic beauties. On the other hand, her sister struggles.

'I don't like the sister's face. She should only show her back.'

However, he lavished praise on former Spice Girl Victoria Beckham, saying he liked her slim figure and claiming they have the 'same eating habits'.

It's not the first time Lagerfeld has attacked famous people's looks. Earlier this year, the 78-year-old was forced to apologise after calling Grammy award winner Adele 'too fat'.