Kelly Cristina dos Santos, better known as Cris Vianna (born April 11, 1977) is a Brazilian actress, model, and former singer.

Vianna was born in São Paulo. At the age of 13, her father, a sportsman, died. She was forced to pay for her studies the following year, as her mother, a nursing assistant, had to take care of the house and two other children. Vianna began taking care of two children, aged 5 and 7 years old, who were the daughters of a neighbor. She began her modelling career as a teenager, after knocking on the door of several agencies until she managed to schedule fashion shows and TV commercials. Vianna walked the runways in Italy, Canada, Australia and Germany.