(CNN) -

Is this the Katy Perry primary?

Days after Perry took a photo with Hillary Clinton, the pop icon took a selfie Tuesday with Vice President Joe Biden, another potential presidential contender for the Democratic nomination in 2016.

"Brought my pink pony to the White House to holler @VP Joe Biden," she wrote on Instagram.

"P.s. He made me call my 93 year old grandma to thank her for my baby blue eyes! What a Q-T," she added.

Washington marked Perry's latest stop on her "Prismatic World Tour."

The vice president and his granddaughter are fans of Perry's music, and he invited her to come in to say hi and meet them while she is in town, an official from Biden's office told CNN.

She met Clinton at a book signing Thursday in Los Angeles, where she offered to write the former secretary of state "a 'theme' song if she needs it."

Besides being a Clinton fan, Perry is a major supporter of President Barack Obama.