Katy Perry is rallying students at UNLV for Hillary Clinton on the first day of early voting in Nevada.

The singer surprised students Saturday afternoon when she knocked on the doors of their dorm rooms wearing a T-shirt that read "Nasty Woman." That's a phrase Trump uttered at Wednesday's debate that's become a rallying cry for Clinton supporters.

After some squealing and selfies with the students, she urged them to cast their ballots for Clinton.

She headlined a short outdoor rally on campus afterward along with Nevada Democratic Senate hopeful Catherine Cortez Masto, but didn't perform any of her songs.

Polls show both the presidential and U.S. Senate races are close in Nevada.

Perry campaigned in Las Vegas for Barack Obama in 2012 wearing a dress decorated like a ballot.

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