Mbappe missed the first pen.
Then when PSG got awarded another penalty later on in the game, Neymar was quick to grab the ball and take the pen - which he scored.
Mbappe was very salty about Neymar taking the pen and as the team were celebrating the scored penalty by the corner flag - Mbappe was one of the last to make it over, slowly walking across to them.
He really is becoming a massive prick - used to like him, but really starting to despise the guy.