A myriad of Hollywood types are heading to the District this week, but instead of the lighthearted nature of attending the recent White House Correspondents' Dinner, this week they'll be tackling much heftier topics.

First to come through town was "Friends" alum Matthew Perry, who made a trip to the White House during the day Monday and then capped off his trip with a briefing on Capitol Hill that evening. Perry is once again discussing the issue of drug courts, but this time he's talking about their effectiveness in curbing prescription drug abuse.

On Tuesday morning, it's Demi Lovato's turn. The actress and singer will appear alongside Health and Human Services Secretary Kathleen Sebelius as part of National Children's Mental Health Awareness Day. As you may recall, the former Disney star checked into a rehabilitation center in 2010 to get help with substance abuse, self mutilation and bulimia. Since then, she's mentored young people going through similar things and at the D.C. event will be commended for these efforts.

Also being honored this week is "Breaking Bad" star Bryan Cranston, in town Tuesday night for the Hope Awards Gala being hosted by the National Center for Missing & Exploited Children. He and his wife, Robin, have been involved in this issue since 1990 and even produced an instructional DVD titled "KidSmartz," that used NCMEC guidelines to teach children how to avoid kidnappers and online predators. Cranston will appear alongside abduction survivor Jaycee Dugard and retired NFL player and former Rep. Steve Largent, the head CTIA-the Wireless Association, being honored for his organization's work on wireless Amber Alerts.