Kim Kardashian says she is fascinated by the fact that her sister Kourtney is lighter than her after having a baby four months ago.
"My sister weighs less than I do, and she just had a baby - so that's kind of fascinating to me!" says the reality star, pictured with her two siblings at Kourtney's birthday celebrations this weekend.
When Kourtney, 30, revealed breastfeeding helped her drop the pounds, younger sis Khloe seemed keen to take on the tip.
"If that's all it takes, breastfeeding? Then someone breastfeed off me! I don't care!" joked Khloe (centre).