France striker led his Paris St-Germain team-mates in mimicking Haaland's trademark 'Zen' celebration after knocking Borussia Dortmund out of the Champions League.
After celebrating on the pitch in front of empty stands at a Parc des Princes closed to spectators because of coronavirus, Mbappe encouraged his jubilant team-mates to strike the same pose in the changing room for an Instagram live video, reports BBC Football.
Match of the Day presenter Gary Lineker tweeted that PSG's move showed a "lack of class", while some fans on social media suggested the celebration showed Haaland had "really rattled Mbappe and Neymar".
Norway international Haaland, 19, has been a sensation since joining Dortmund from Red Bull Salzburg, scoring 12 goals in 11 games. The striker occasionally adopts the 'Zen' celebration because of his love of meditation and says the move gives him a sense of calm and tranquility.