Khloe Kardashian won't ever give her sister Kim marriage advice.

The reality TV star insists she has learnt from past experience it's best to let couples work out their problems themselves and she has no intention to get involved with her older sister's relationship with new husband Kris Humphries.

Khloe - who is married to basketball player Lamar Odom - told E! News: "I do not like to give advice unless someone asks, but even then it has to be generic. Because you never know what happens behind closed doors. Whenever people tell you a sob story or a bad story, it's never the full story."

The 27-year-old socialite applies her no advice rule to her own union and never involves third parties in her and Lamar's marriage.

She explained: "I've learned with me and my husband, we keep things to ourselves and work it out with each other and it works out better. When you get opinions from every friend, you get so much BS thrown in, so I try not to give advice unless I'm asked."

Khloe partied with Kim and Kris at The Marquee nightclub at the Cosmopolitan Hotel in Las Vegas on Saturday night (22.10.11) as the newlywed celebrated her 31st birthday.

During the evening, the couple were presented with a sports car-shaped cake that featured dolls of them at the wheel.