Vice President Joe BidenJoe BidenTop union offers backing for Ellison in DNC race John Kerry to teach at Yale on global issues Ellison needles Perez for 'unverifiable' claim of DNC support 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 ClintonFive big Trump narratives to watch NBC: Russia setting up dossier on Trump Chelsea Clinton attends Muslim solidarity rally in NYC 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.”