Khloe Kardashian is planning a raunchy bachelorette party for sister Kim.

The 30-year-old socialite is set to marry basketball star Kris Humphries later this year and sibling Khloe wants to make her last party as a single woman as tacky as possible because she knows she'll hate it.

Khloe - who married basketball star Lamar Odom in September 2009 - told E! Online: "I want to do it as bad as possible because she's so uncomfortable by it, and it's funny. For my bachelorette party, it was so over the top, so I want to be as annoying as possible with The Bachelorette thing."

While she can't wait for her sister to get married, Khloe is unsure if Kim will start trying for a baby straight away.

The 26-year-old reality TV star - who has made no secret of her desire to start a family - said: "I don't know. I really don't. If Kim does have a kid soon, I think she's gonna have to slow down so much. So I just don't know if she's ready to slow down that much."