Credit: Katy Perry sparkled in a slinky, silver dress Thursday as she belted her new song "Rise" and her signature "Roar" for an audience of Democratic delegates waving their glowing cellphones.

Correction: DEM 2016-Convention-Celebrities story

Meet the third-party candidates running for president

Photos: 2016 Democratic National Convention in Philadelphia

Day 4: Speeches at the Democratic National Convention

Clinton’s journey and other milestones for women in government

Md. Medal of Honor recipient took stage at DNC