Kim Kardashian owns a $115,000 watch.

The Millionaire socialite revealed her extravagant purchase during a joint interview on 'Piers Morgan Tonight' with her sister Kourtney.

When the British interviewer quizzed the sisters on what the single most expensive item either of them had bought for themselves was, Kourtney, referring to her sibling, said: "Probably a watch for yourself."

Explaining her purchase, Kim said: "It was a watch that was $115,000. But I got a really good deal and I traded two in for it. So technically I was out of pocket about $50,000 or $60,000. I don't think I could ever go and just spend that much."

Although Kim is happy to spoil herself, Kourtney admitted she isn't as keen on spending money herself and prefers to save her cash for her 13-month-old son Mason - her child with boyfriend Scott Disick.

Piers asked the pair: "Did you have think you'd be in a position to spend $115,000 on a watch?"

To which Kourtney, 31, replied: "I don't do that stuff for myself. I just think that ... I don't have as much money as Kim and I have a baby and I'm like thinking about college and expenses."

The interview will be screened on CNN in the US on Thursday (27.01.11) and on CNN International a day later.