Mbappe opened the scoring for PSG against Barcelona on Wednesday when he netted from a penalty in the 31st minute of their last-16 second leg clash.
This was Mbappe's 25th Champions League goal at the age of 22 years and 80 days whereas Messi set this record aged 22 years and 286 days.
Mbappe gave PSG a crucial lead in the second leg which meant that the striker has now scored four goals against Barcelona in this season's Champions League, thus becoming the first player to score that many goals against the Catalan giants in a single season in the competition.
Not only in Europe, but domestically too, Mbappe has been brilliant for PSG.
The French World Cup winner has netted six goals in his last seven Ligue 1 matches in addition to his Champions League exploits against FC Barcelona.
PSG are still chasing their first ever UEFA Champions League crown after narrowly missing out on the title last season after being beaten 1-0 by an unstoppable Bayern Munich side at the Estadio da Luz in Lisbon on August 24, 2020.