John Legend was all smiles with his kids after the exhilarating World Series game 1 ending ... and Chrissy Teigen took a moment to give him a fun jab for his apparent lack of baseball knowledge.
Here's the deal ... the Dodgers defeated the Yankees thanks to a history-making walk-off grand slam ... belted by Freddie Freeman in the bottom of the 10th inning.
John celebrated the moment with his kids and posted the snap to Instagram .