Taylor Swift, Train ‘Drive By’ New Jersey (WATCH)

The surprises keep coming on Taylor Swift's Red tour. During her third and final night at the Prudential Center in Newark, N.J., the superstar told her sold-out crowd, "I called up one of my favorite lead singers of one of my favorite all-time bands and asked him if he'd like to come play with me in Newark. And you know what? He said yes! So Newark, how would you feel if I told you that Pat Monahan from Train is here to play for you?" Watch below as the two duet on Train's "Drive By."

Other unexpected duet partners on the Red tour so far have included a very special fan duet in Charlotte, N.C. Taylor invited a 7-year-old fan named Emma, who has a rare blood disorder, on stage with her to sing "Sparks Fly." (Watch here.) Rap icon Nelly was the special guest in St. Louis, joining his buddy for a duet of his hit, "Hey Porsche." And Neon Trees frontman Tyler Glenn was Taylor's surprise guest during her second night in Newark, collaborating with her on his band's infectious song, "Everybody Talks."

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