The special guest was announced yesterday - Vanness will sing a duet with Gigi and also one of his own songs solo.
In addition to holding charity concerts, Gigi has been an ambassador of UNICEF for many years. She recently completed a trip to visit a hospital in a poor, remote region of Inner Mongolia. Vanness Wu is also a UNICEF supporter, earlier this year he traveled with Charlie Young to the nation of Djibouti in Africa.