Lady Gaga has called on Americans to vote for Joe Biden because "we needed somebody that was going to bring us all together for this moment, for this very important moment".
The 34-year-old Grammy winner joined Mr Biden on the eve of the US Presidential election at a rally in the workers' stronghold of Pittsburgh.
Gaga, clad in a white sweatshirt with "Joe" printed on the front, sat down at a white piano to give a short but inspired musical warm-up to the Biden headliner, peeling off her gloves.
"Gloves off because it's a fight – a fight for what you believe in," she said before launching into her hit "Shallow".
She called on the audience to vote for Mr Biden because "we needed somebody that was going to bring us all together for this moment, for this very important moment".
"No matter who wins tomorrow, we're going to have to do this together. Tomorrow's got to be peaceful," she said, alluding to the tensions that have swelled in the US before the poll.
The singer, who once lived in Pennsylvania, has been in this position before.
In 2016, she helped close out the campaign of Democrat Hillary Clinton, who lost in a shocker to Mr Trump.
Dancing in the car park was Jamie Scafuri, a 26-year-old hairdresser, who came with friends invited by someone who works for the campaign.
"We're hoping that it's the end of the Trump era," Scafuri told AFP. "We're hopeful. That's why we're here."
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