Katy Perry: Obama Concert & Hammer Gala Performer!

Katy Perry hits the stage in Elie Saab at the 2012 Hammer Gala in a shimmery dress on Saturday (October 6) at the Hammer Museum in Westwood, Calif.

The next day, the 27-year-old singer was one of the many performers who graced the stage at the 30 Days to Victory Concert to support Barack Obama‘s presidential bid.

During the show, Katy performed the song “Let’s Stay Together,” which Obama famously sang a few lines from earlier this year, as well as her hits “Teenage Dream,” “Part of Me,” and “Firework”.

Also pictured: President Obama speaking at the event.

15+ pictures inside of Katy Perry and President Obama appearing on stage…