David Cameron sold a meet-and-greet with Justin Bieber for £10,000 to raise money for the Conservative party's general election campaign.
The prime minister auctioned off the prize to the highest bidder during the Tories' annual Black and White Party, The Sun reported.
The buyer will be able to go backstage and meet the Baby hitmaker at his gig at London's O2 Arena on 7 March.
A wealthy financier is believed to have paid more than £10,000 for the prize, which was gifted to four teenage girls.
Access to the 18-year-old star, described as "every girl's dream" in the catalogue advertising the auction, was reportedly donated by Universal Music UK, his record label in Britain.
The description added: "The four golden ticket holders will get the chance to go backstage to meet face-to-face with the gorgeous teen heartthrob".
Although the singer was unaware of the auction prize, a a record label spokeswoman said that Bieber "wouldn't expect to be informed" about who got special passes for backstage meetings.