Not the one you're thinking about, either. One that really matters.

Lauren Conrad is urging people to visit Participate.net/DarfurNow to help end the unspeakable atrocities in the Darfur region of Sudan. The Hills star is just one of many stars taking part in a series of videos produced by Participant Productions as part of its campaign inspired by the film "Darfur Now."

We applaud Lauren Conrad for getting involved in such an important cause and urging others to take action and stop the continuing human rights violations in Darfur.

In far less important news involving Ms. Conrad, it looks like Lauren and Heidi Montag may not be friends again just yet, as they nearly come to blows on this coming Monday's episode of MTV's The Hills, according to Us Weekly.

In a sneak peek of Monday's The Hills, Conrad confronts Montag about allegedly spreading those nasty sex tape rumors at the Hollywood hot spot Les Deux.

"You can keep saying that and make yourself think you're a good person, but you're a bad person," Lauren Conrad tells her former BFF and roommate.

Follow this link to watch the Lauren-Heidi drama.