Photo: Lloyd Bishop/NBC via Getty Image Travis Kelce has not been keeping up with his indie mumblecore. While on Late Night With Seth Meyers on October 8, Taylor Swift regaled the audience with the story of her loving fiancé’s greatest Eras Tour gaffe: not knowing what Greta Gerwig looks like. In London on night two of the tour, celebrities in attendance included not just Swift’s then-boyfriend, but also Tom Cruise, Hugh Grant, Ashton Kutcher and Mila Kunis, and Greta Gerwig. “I was like, ‘I