Sir Keir Starmer met Taylor Swift when he attended her concert at Wembley Stadium, Sky News understands.
It has emerged the prime minister and his family spoke to the pop star and her mum for 10 minutes and discussed the Southport stabbings.
The revelation comes amid questions over government intervention in talks over the security for the concerts after Swift was given a taxpayer-funded police escort despite reservations from the Met.
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It had not been clear previously if Sir Keir and Swift had met at the gig.
There was no discussion about the provision of security for the artist, which Downing Street said was an independent operational matter for police, it is understood.
Sir Keir and his family were given free tickets to the concert on 20 August, which were declared as required, and have since been paid back.
Taylor Swift performing at Wembley Stadium. Pic: AP
The meeting came after the superstar cancelled gigs on her Eras Tour in Austria due to a terror threat, and the mass stabbing in Southport at a Taylor Swift-themed dance class, when three young girls were killed.
Sir Keir was invited to the August show by Universal Music, which is based in his constituency of Holborn and St Pancras.
He paid back the cost of the tickets after a row over ministers accepting freebies dominated headlines during his first 100 days.
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Questions over Taylor Swift…
