The much talked about shift has taken place just ahead of the winter transfer window deadline with Chelsea breaking the British transfer record to capture the star striker.
Torres said he was delighted to land at Stamford Bridge and is looking forward to a prosperous career with the Blues after penning a five-and-a-half-year deal.
"I am very happy with my transfer to Chelsea and I am looking forward very much to helping my new team-mates this season and for many years to come," he said.
"Having played against Chelsea many times since coming to England, and in some very big games I will never forget, I know there are many great players here and I will work hard to win a place in the team.
"I hope I can score some important goals for the supporters to enjoy this season."
"We have long admired the talents of a player who is a proven goalscorer in English football and Fernando's arrival is a sign of our continuing high ambitious. I hope every Chelsea fan is as excited as I am with this news."