While she's up to her ears in roommate drama, The Hills star Lauren Conrad still finds time for a cause close to her heart – dating violence.

Part of the profits from Mark, the beauty / accessories line she promotes for Avon, will be donated to groups involved in stemming dating violence.

NOTE: We're not entirely sure what constitutes "dating violence." Just domestic violence, but ... on dates? Is this a known, common phenomenon?

In any case, Lauren Conrad writes on her MySpace celebrity blog:

"I have partnered with Mark in its first initiative, aimed at ending the cycle of dating abuse and violence. Women ages 16-24 experience the highest rates of partner violence, and mark and I want to change that statistic."

The 22-year-old LC will serve as honorary co-chair of a panel that will select up to five organizations that will receive the funds.

Twenty dollars from every $22 "Have A Heart" necklace sold by the cosmetics line will help fund the project, Lauren Conrad said, adding:

"Abuse is a devastating cycle. By purchasing this necklace for yourself and your friends, you'll support the cause and raise awareness."

For her next charitable endeavor, LC is heading a task force** aimed at stemming "Parental Cashing-in Syndrome." Look out, Lynne Spears!

** - no, she's really not