Terrific Travis TMZ.com
Taylor Swift's mixing business and pleasure -- finally bringing Travis Kelce out onstage with her in London Sunday ... and, we gotta say he nailed the choreography.
The singer-songwriter took the stage in England's capital Sunday -- her third show this weekend -- and, her footballer boyfriend went from spectator to spectacle ... hitting the stage in a tuxedo and top hat.
This all went down during "The Tortured Poets Department" part of her set .