Former Barcelona forward Neymar arrived in Paris as PSG's star man but he has company at Parc des Princes, where Mbappe continues to shine.
Mbappe scored four goals in 13 second-half minutes as Ligue 1 champions and runaway leaders PSG routed Lyon 5-0 - the 19 year-old also winning the penalty for Neymar's opener.
Neymar's seven-year-old son - Davi Lucca da Silva Santos - is a big admirer of the French teenager and World Cup winner.
"My son loves Mbappe a lot," Neymar said. "I took him to training and he was talking about Kylian all the time.
"He wanted to take a picture to show his friends at school, he took it and was very happy."
Mbappe's rapid four-goal haul is the fastest in a single Ligue 1 match for 45 seasons.