Hillary Clinton continued to buddy up to stars this weekend, hanging out with pop star Katy Perry at a Saturday night concert in Philadelphia in an effort to attract young voters to her liberal cause.

“More than 37-and-a-half million people in our country have already voted,” Clinton told the crowd gathered at the Mann Center for the Performing Arts. “Now why are they out there voting? Because I believe they are standing up for a hopeful inclusive vision of America. I’m asking you to stand up for that same vision when you come out to vote on Nov. 8.”

“We’re in a war for the soul of America,” said Shonda Rhimes.

Sen. Cory Booker (D-N.J.), former Secretary of State Madeleine Albright, TV guru Shonda Rhimes and actress Debra Messing also talked up Clinton from the stage.

Rhimes said, “America is not a TV show.” And added, “We’re in a war for the soul of America.”

“This is a party with a purpose — we have three days left,” Booker said.

“Some say I should just stick to singing and being a pop star,” said Perry, who performed in front of a backdrop that said “Love Trumps Hate.” “Well, I am using my voice.”

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Perry wore a red, white and a blue dress with a long blue coat that said, “I’m with Madam President” on the back.

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Trump took aim at Clinton’s celebrity endorsements, telling an audience at a Hershey, Pennsylvania, campaign rally on Friday: “I didn’t have to bring J-Lo or Jay Z. I’m here all by myself. Just me. No guitar. No piano. No nothing.” He also mentioned it several times on Saturday during various rallies, telling a Florida crowd early in the morning, “We don’t need Jay Z to fill up arenas.”

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Clinton has set her closing campaign ad to Perry’s song, “Roar,” to air Saturday through Election Day in 11 states identified as battlegrounds: Arizona, Colorado, Florida, Iowa, Michigan, Nevada, New Hampshire, North Carolina, Ohio, Pennsylvania and Wisconsin.

The spot features images of everyday Americans with descriptions of what they’re voting for, including, “I’m voting for the planet,” “I’m voting for debt relief,” and “I’m voting for our future.”

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Perry has been a big campaigner for Clinton. She performed at the Democratic National Convention and even dressed up as Hillary for Halloween.

Perry’s performance follows Clinton’s appearance at a Jay Z and Beyoncé concert on Friday night in Cleveland, where Hillary seemed to have no clue — or didn’t care  at all — that Jay Z was singing some really nasty lyrics, complete with the “N” word, the “F” word and much more that was crude, crass and demeaning to everyone in the audience and beyond.