Rumors had swirled beforehand that Zhou would be announcing her engagement to actor Archie Kao at Wednesday's concert in Hangzhou, the capital of China's eastern province of Zhejiang.
But after she sang, she went backstage to change her outfit and reappeared in an ivory Chanel wedding gown, holding a bouquet. As the crowd broke into a loud cheer, she was joined on stage by Kao, who was wearing a black tuxedo.
The couple then surprised everyone by announcing they were getting married onstage. They went on to exchange vows and rings in front of the audience.
After saying "I do," Kao told the crowd, "It's love that brought us all here tonight, and it's also love that brought me and my wife together."
A beaming Zhou said she's played a bride in several movie roles, but is happy that she's getting her own happy ending.
Zhou's official Weibo account quickly posted a photo of the pair in their wedding ensemble, sharing a kiss. It's the first marriage for both.
Zhou, 39, is one of China's most sought-after actresses and made her Hollywood debut in Cloud Atlas, starring alongside Tom Hanks and Halle Berry.
Kao, 44, is a Chinese-American actor whose credits include the television series CSI: Crime Scene Investigation and Snow Flower and the Secret Fan.