David Harbour Reveals Taylor Swift Sent His Stepdaughter a "Handwritten Letter" at the Eras Tour

Swift hasn't had many musical guests appear alongside her on the Eras Tour so far, but she was joined by the Mumford & Sons frontman on March 25 in Las Vegas. "Last night in Vegas Marcus Mumford showed up and surprised the crowd with 'Cowboy Like Me' so like 🤩🤯😝!" Swift wrote on Instagram. "Thank you to @marcusmumford and that glorious crowd. See you next weekend in Texas!"