Watch: Taylor Swift and Marcus Mumford perform 'Cowboy Like Me' together live.

Watch: Taylor Swift and Marcus Mumford perform 'Cowboy Like Me' together live.

Marcus Mumford contributes backing vocals to Taylor Swift's 'Cowboy Like Me', so it's only fitting that he turned up as a surprise guest to perform the song with Swift live tonight at The Eras Tour in Las Vegas.

Watch the performance below...

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