Legend and Teigen visited the ballpark while in Washington for the singer's Darkness and Light tour. The couple both shared several photos on Instagram from the outing.
"Mommy and daddy posing. Luna stealing the Mariners' bubble gum #LunasFirstTour #Seattle," Legend captioned a photo of himself with Teigen and Luna in the dugout.
Legend started his tour May 12 in Miami and will bring the venture to a close June 30 in New Orleans. He confirmed in an interview with People in April that he would bring Teigen and Luna on the road.
"I'm excited that we're in the position where we can bring [Luna] on tour this summer and late spring, so that'll be fun," the star said. "I'm in a position where we can make things happen to make sure she's around us as much as possible."
"Diapers on the bus, a crib on the bus -- a long way from my bachelor days," he jokingly added.