The Hunger Games' Liam Hemsworth and girlfriend Miley Cyrus helped honor everyday people who accomplish extraordinary things during the 5th annual CNN Heroes: An All-Star Tribute in Los Angeles. "How cute did Liam look last night?!?!!" Cyrus gushed via Twitter. "I felt like one of those cartoons all night w/ big hearts flying out of my eyes!" Click through the gallery to see Demi Lovato, Christina Hendricks and more stars at this weekend's hottest parties!