Vice President Joe BidenJoe BidenBiden: We need Canada 'very, very badly' The Hill's 12:30 Report Clinton reappears on Capitol Hill for Reid send-off MORE took a selfie with pop singer Katy Perry at the White House Tuesday ahead of her concert at Washington, D.C.’s Verizon Center.

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She posted the photo on her Instagram account and said Biden made her call her 93-year-old grandma to thank her for her blue eyes.

Their meeting comes just days after Perry met another possible 2016 presidential hopeful, Hillary ClintonHillary Rodham ClintonIs Van Jones another conflict of interest headache for CNN? The Hill's 12:30 Report Judge refuses to end Wisconsin recount: report MORE.

Perry posted a photo with Clinton on her Instagram, and said she offered to write a 2016 campaign theme song if Clinton runs for president.

Clinton eventually responded on Twitter and suggested that Perry already wrote her one—“Roar.”