Vice President Joe BidenJoseph (Joe) Robinette BidenBiden says 'enough is enough' after Santa Fe school shooting Zinke provided restricted site tours to friends: report Democrat wins Philadelphia-area state House seat for the first time in decades 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 Diane Rodham ClintonStopping Robert Mueller to protect us all Hillary Clinton hits Trump, pulls out Russian hat during Yale speech Giuliani: Mueller plans to wrap up Trump obstruction probe by Sept. 1 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.”