City staged a superb second half fightback which stunned PSG and puts us in the ascendancy ahead of the return leg at the Etihad Stadium.
The hosts were hugely impressive in the opening 45-minutes and deserving of their lead, but City were dominant after the break to turn the tie on its head.
De Bruyne levelled in the 64th when his teasing cross evaded everyone and bounced into the far corner with Kaylor Navas rooted to the spot and, with Mauricio Pochettino’s men unable to muster a response, Mahrez fired a free-kick through the wall to beat the keeper from 20-yards.
The night got worse for the home side as midfielder Idrissa Gueye received a red card for late tackle on Ilkay Gundogan.
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