10 celebrities Taylor Swift has brought on stage for her tour (+Photos)

4. John Legend

There’s never a dry eye in the crowd when John Legend performs “All of Me,” and Taylor’s tour was no exception. The two sang the song together at the Staples Center in Los Angeles on August 25, which came as a last-minute surprise to even Taylor herself. She tweeted, “I heard @johnlegend and Chrissy were on the way to the show & called and asked if John felt like playing ‘All of Me’.” And, that’s just what he did. From the audience, John’s wife, model Chrissy Teigen, snapped a shot of the duo’s performance captioning it, “All of me loves all of T.”