Star Dakota Johnson made a surprise appearance on “ Saturday Night Live ” this week, playing the mysterious “Madeline” during Lily Allen ‘s performance of that track. The song was Allen’s second of the night.

During the performance, Johnson was mostly hidden through the song, as Allen sang about the mysterious mistress. But Johnson performed the spoken word portion of the song, which appears on Allen’s album “West End Girl.” In the song, Allen notes that she and her signficant othe r “had an arrangement: Be discreet and don’t be blatant. And there had to be payment. It had to be with strangers

But you’re not a stranger, Madeline.”

Later in the song, “Madeline” explains her side of the story: “I hate that you’re in so much pain right now

I really don’t wanna be the cause of any

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