Director general Jorge Valdano had promised president Florentino Perez's second spell at the helm would be a "super-production" and they did not disappoint with the presentation of their first signing.
"It is a very special day for me. I hope I can write my name in the club's history books with victories and conquests," a slightly overawed Kaka said from a stage on the pitch.
The doors of the stadium had been thrown open to the public who packed the stands around a stage decorated with the club's nine European Cups.
"It will be a privilege to play alongside him," Kaka told a news conference.
"There won't be any rivalry with Cristiano. We are compatible on and off the pitch. We are experienced players and there is no room for jealousy."
"From my experience I have learned that talent alone is not enough. There are many talented players who have won nothing and others with less ability who have been successful," he said.
"It is good to have talented players but they have to sacrifice themselves for the team."
Spain defender Raul Albiol, who joined Real for a reported fee of 15 million euros from Valencia, is expected to be presented later this week.
