Katy Perry had an A-list escort to the DNC stage Thursday night.
Orlando Bloom was right by her side in the moments before Katy stepped out to perform her hits, "Rise" and "Roar" ... just ahead of Hillary Clinton's intro in Philly's Wells Fargo Arena.
Our DNC sources tell us both of them milled around backstage, talking to fans and taking in all the hoopla.
You can tell by the look on her face, Katy -- who's performed at multiple Clinton campaign events -- was all business about her role in the historic night.
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