Angel Di Maria scored a brace and Julian Draxler and Edinson Cavani netted 1 each to seal a dominating victory for PSG over giants Barcelona in the first leg of the round of 16.
The Catalan giants looked helpless in front of a spirited PSG side who outclassed the visitors in all departments.
Barcelona now needs a miracle to overturn the current scenario and qualify for the next round which at the moment looks impossible.
In another game, SL Benfica defeated Borussia Dortmund 1-0 thanks to a 48th-minute goal from Konstantinos Mitroglou.
Dortmund's star striker Pierre-Emerick Aubameyang missed a penalty in Dortmund's night to forget.
Here are some images from Champions League night:
Angel Di Maria (left) celebrates
Paris Saint-Germain humiliated FC Barcelona 4-0 thanks to a marvellous brace from Angel Di Maria.
Edinson Cavani celebrates
Other than, Angel Di Mari and Julian Draxler, Edinson Cavani too got his name to the scoresheet against Barcelona.
Lionel Messi (centre) could not make a mark against PSG
It was a night to forget for FC Barcelona's little magician Lionel Messi who displayed one of the worst performances of his entire career. The Argentine failed to make any impact in the game and looked helpless most of the times.
Konstantinos Mitroglou celebrates
Konstantinos Mitroglou's goal early in the second half helped Benfica seal a crucial win over Dortmund in the first leg.
Dejected Borussia Dortmund players
Borussia Dortmund played terrible football against Benfica as they lost the first leg tie 1-0. Their star striker Pierre-Emerick Aubameyang missed a penalty.
Images are taken from PSG, Barcelona, Dortmund and Champions League Twitter handles