Last week, actor Dennis Quaid addressed Congress on the subject of medical errors following the near death of his twin infants. What other topics have celebrities brought before Congress?

Carlos Mencia—Formally apologizing for his provocative and controversial political humor

Liza Minnelli—Just here to sing a little song for you all

Matthew McConaughey—Researching role of do-nothing freshman senator that is disarmingly charismatic

Julia Roberts—Sought official renewal of her "America's Sweetheart" designation through 2013

Angelina Jolie—Making sure the members of the House know about babies

Lindsay Lohan—Rambling, incoherent rant about how it's not her fault

Matt Dillon—Sports

Mary-Kate Olsen—A new strategy to deal with increased violence in Iraq perpetrated by extremist cleric Muqtada al-Sadr's Mahdi Army