Kim Kardashian has claimed that her sister Kourtney weighs less than she does after having a baby.

The oldest Kardashian sister, who recently celebrated her 31st birthday, gave birth to her first child last year.

Speaking to Us Weekly, Kim said: "My sister weighs less than I do, and she just had a baby, so that's kind of fascinating to me! She looks amazing!"

It was recently reported that Kim was beaten by ex-husband Damon Thomas during their marriage.