Khloé Kardashian Odom almost always has an opinion—except when it comes to other people's relationships.

While celebrating her sister's 31st birthday in Las Vegas on Saturday night, Khloé (who clashed with Kris Humphries during their E! wedding special) said she tries not to offer marriage advice to her sister...or anyone.

How come?

PHOTOS: Kim's 31st Birthday Bash!

"I do not like to give advice unless someone asks, but even then it has to be generic," Khloé told E! News this weekend as she helped Kim celebrate during a soiree at Marquee nightclub. Why?

"Because you never know what happens behind closed doors," she explained. "Whenever people tell you a sob story or a bad story, it's never the full story."

What works best for her and man Lamar Odom is keeping their problems between the two of them. "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."

Kim will be doling out marital advice herself on the big screen soon.

The birthday girl just landed a role in Tyler Perry's The Marriage Counselor.

"We start filming next week in Atlanta so I'm just so honored to be doing a film with Tyler," Kim told us. Sounds like 31 is off to a great start!

WATCH: Kim talks movie role

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