Katy Perry takes over Hillary Clinton's Instagram

Democratic presidential candidate Hillary Clinton holds a campaign rally with her husband former President Bill Clinton and singer Katy Perry in Des Moines, Iowa. (Reuters)

Hillary Clinton arrives with Katy Perry during a campaign rally with her husband, former President Bill Clinton, in Des Moines. (Reuters)

Katy Perry rallies supporters of Democratic presidential candidate Hillary Clinton outside the Iowa Events Center before the start of the Jefferson-Jackson dinner. (AFP/Getty)

Katy Perry listens to the national anthem at the Jefferson-Jackson dinner. (AFP/Getty)

Katy Perry attends the Jefferson-Jackson Dinner as a guest of Democratic presidential candidate Hillary Clinton. (AFP/Getty)

Katy Perry, wearing a dress with Democratic presidential candidate Hillary Rodham Clinton's campaign logo, arrives at the Iowa Democratic Party's Jefferson-Jackson Dinner. (AP)

Katy Perry rallies supporters of Democratic presidential candidate Hillary Clinton. (AFP/Getty)

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