The designer, 78, said Pippa Middleton should “only show her back”, saying she “struggles” with her looks.
Lagerfeld, who apologised to singer Adele earlier this year after condemning her as “too fat”, has given a harsh critique of 28-year-old Miss Middleton. 
Karl Lagerfeld and Pippa Middleton © PA/Rex
In contrast, he has praised sister the Duchess of Cambridge for her “romantic” beauty and “nice silhouette”.
He has also given his approval for her marriage to the Duke of Cambridge, conceding she was the “right girl for that boy”.
[Related article: Karl Lagerfeld apologises to Adele sending her a collection of Chanel bags]
Lagerfeld's comments, disclosed by the Sun newspaper, appear to have been made during a discussion of the Middleton sisters’ styles.
He appears to be referencing the now-famous photograph of the younger Miss Middleton from behind, as she took the role of bridesmaid at the Duchess’ wedding.
The image was beamed around the globe and led Miss Middleton to being nicknamed “Her Royal Hotness” by some in honour of her posterior.
Lagerfeld, creative director of Chanel, has now said: “Kate Middleton has a nice silhouette and she is the right girl for that boy.
"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."
Lagerfeld also praised former Spice Girl and fashion designer Victoria Beckham for her slim figure, saying they had the “same eating habits”.
"She is great. I like her a lot. I have known her for many years,” he said.
"And that body, after four children. There are not so many who have a body like that. She is very disciplined.”
In February this year, Lagerfeld said of Adele: “She is a little too fat, but she has a beautiful face and a divine voice.”
He later apologised for his comments.
More from the Telegraph.
