Sadiq Khan's parents emigrated to Britain in the 1960s. Khan's win has been featured on the front pages of all national newspapers and is causing a stir on the social media.
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"Congratulations @SadiqKhan 4 being elected mayor of London," tweeted Bilawal Bhutto, leader of the opposition Pakistan People's Party and son of former prime minister Benazir Bhutto.
"British Pakistanis need +ve rolemodel," he added.
Chairman PTI, Imran Khan -- whose ex-wife Jemima is the sister of Sadiq Khan's principal opponent Zac Goldsmith -- also tweeted his congratulations to the new mayor.
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Elsewhere on social media most Pakistanis appeared to greet Khan's win with pride, with messages marking the recent successes of other high-profile British Muslims -- including former One Direction member Zayn Malik, who also has Pakistani heritage -- going viral Saturday.
Some could not resist pointing out the irony of the jubilant reaction in the deeply conservative country.
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"Pakistani: Sadiq Khan won! Reporter: So you'd vote for a minority immigrant son of a bus driver as Mayor of Karachi? Pakistani: Are you mad?" tweeted newspaper columnist Bina Shah.
Khan has told media that he has relatives in the port megacity of Karachi, where his grandparents reportedly migrated after the partition of India and the creation of Pakistan in 1947, as well as Faisalabad in Punjab and the capital, Islamabad.
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