Kourtney Kardashian thinks she could beat her sister in a fight.

The 31-year-old socialite and her younger sibling Kim Kardashian admits they haven't always seen eye-to-eye, and though they have never come to blows, Kourtney thinks she would come out on top if their rows ever got physical.

When asked if she could beat Kim in a fight, Kourtney said: "Yeah."

Kim added: "She uses her nails! I just run. She digs her nails."

However, the elder sister insisted that Kim can be equally violent.

She told Hollyscoop: "She pulls hair."

Although they get on well now, the sisters - who are just 18 months apart in age - used to row quite frequently when they were younger, in particular with jealousy arising over friendships.

Kourtney said: "Are we competitive? Definitely growing up. Kim and I are 18 months apart, so growing up like..If I would hang out with Kim's friends too long."

Kim added, "I used to always get mad if you were hanging out with my friends."

Last November, Kim was left nursing a black eye after a charity boxing match got out of hand.

She said after the bout: "My girl was a good sport, but she was tough! I knew I had to do it for charity, since that's what it was all about, but man, my girl could throw a punch!"