Japan's Princess Kako, niece of Emperor Naruhito, paid a courtesy call on Austrian President Alexander Van der Bellen on Monday to mark the 150th anniversary of diplomatic ties between the two countries.

The 24-year-old younger daughter of Crown Prince Fumihito, the emperor's younger brother, also visited Palais Augarten and attended a concert by the Vienna Boys' Choir on her first official overseas trip.

When the president told the princess that the boys' choir has performed many times in Japan, she replied that she attended one of their concerts.

Princess Kako told the president that she is very happy about the active exchanges between the two countries.

During her 11-day stay through Sept. 25, the princess will also visit Hungary, where she has been invited also to celebrate the 150th anniversary of diplomatic ties.

After attending a commemorative reception in Austria on Tuesday, she will travel to the Hungarian capital Budapest on Thursday, paying a courtesy call on President Janos Ader and attending a luncheon held by the president and his wife Anita Herczegh on Friday.

Her parents visited Austria and Hungary in 2009.