But Thursday night at CMA Fest in Nashville, Tenn., the country stars teamed up for an extra special performance of "Highway Don't Care."
Taylor was first joined by Tim onstage, and then, to the delight of the crowd, Keith emerged for a guitar solo. After their energetic performance, the trio hugged.
"Thank you @TheTimMcGraw & @KeithUrban for joining my onstage for 'High Way Don't Care' at CMA Fest!" Taylor tweeted. "And thanks for the#1,country radio! FUN!"
Keith tweeted that he had "Such a blast joining @TheTimeMcGraw and @taylorswift13 tonite at #CMAfest!!!"
Taylor also reporters backstage at CMA Fest she's ready to start writing again. "It's starting," she said, as reported by USA Today. "All the anxiety is starting. When the anxiety starts, the writing happens right after, usually."
One thing's for sure: This country-pop star should have plenty of good material for her new album.