Miley Cyrus is postponing her U.S. tour while she recovers from an allergic reaction to antibiotics, but will resume her performances in August. FILE - In this Saturday, April 5, 2014 file photo, singer Miley Cyrus performs at the Barclays Center in New York. Cyrus is postponing her U.S. tour while she recovers from an allergic reaction to antibiotics, but will resume her performances in August 2014.