Hold up -- before you start that car, you'd better put down that cell phone. Texting and driving is bad, and it can kill you and others. If you don't do it for yourself, do it for Justin Bieber, who is continually crusading against the bad habit in order to do a little good for his Beliebers.

Like we reported a few weeks ago, the Biebs has jumped on board with PhoneGuard, the creators of Drive Safe, a phone app that lets you listen to your text messages and emails without using your hands, in hopes that it will create safer drivers. "It is tragic that almost on a daily basis there are reports of deaths and severe injuries caused by drivers who are texting and driving," the singer said in a recent statement. "We need to change the attitudes in our society toward texting and driving and I am making it one of my personal goals to make this happen."

The 'Baby' hitmaker is really putting his money where his mouth is when it comes to the issue. Biebs has helped to raise awareness and funds for charities like the Alex Brown Foundation, which was started to remember a high school senior who crashed her car and died while she was texting.

The pop music icon even spent some one-on-one time with the Brown family this week to make their cause even louder. "great day in LA...got to work with the Brown Family to #stoptextinganddriving with #phoneguard - u have a choice - dont text and drive," Biebs tweeted on Monday. This wasn't their first meeting, though. J.B. also made a surprise appearance on their episode of ‘Extreme Makeover: Home Edition.’

With 10.5 million Beliebers following the pop hitmaker on Twitter alone, the 17-year-old's message is sure to carry onto teenagers everywhere. Don't text and drive, kids.

See Justin Bieber Tell Fans Not to Text and Drive