Credit: George Pimentel/

The one beauty faux pas Kim Kardashian wishes women would stop making?

"I hate when women wear the wrong foundation color," she tells the Toronto Sun. "It might be the worst thing on the planet when they wear their makeup too light."

Karadashian, who turns 30 Thursday, helped launch FusionBeauty ColorCEUTICALS collection earlier this week in Toronto, where she revealed her beauty routine.

It's simple, she says: Toner, cleanser and moisturizers by Perfect Skin. When she's not working, she sports little makeup, foundation and blush, the paper reports.

Her one beauty must-have? "Definitely blot paper or powder," she says.

She says it's inspiring that women turn to her website and Twitter account for beauty and fashion tips.

Says the reality starlet, "I do it for fun and put up fun beauty tips and fashion, so it's really amazing that people read it and follow it."