Taylor Swift was a surprise guest at the red carpet premiere for the Zac Efron film, 17 Again, at the Entertainment Quarter in Sydney, Australia, on Wednesday (March 11). Both performers posed for photos and signed autographs for fans. Swift concluded her Australian tour with a concert at the Factory Theater in Sydney on Thursday (March 12). Her next U.S. date will be March 20 at the Houston Livestock Show and Rodeo.