Kaka was officially presented as a Real Madrid player last night in front of tens of thousands of fans and a huge media contingent at the club's Bernabeu stadium.

An estimated 50,000-strong crowd — almost three times the anticipated number — turned up to watch the ceremony as Kaka was unveiled as Madrid's latest addition by club president Florentino Perez and honorary president Alfredo di Stefano.

Kaka, who completed his medical earlier in the day having landed in the Spanish capital yesterday morning, has penned a six-year contract and has cost Madrid a reported £56million.

The 27-year-old former AC Milan playmaker will wear the number eight at Madrid next season.

There had been speculation that Kaka would be handed the number five shirt that Zinedine Zidane had once worn for Madrid, but the new arrival will instead take up the number eight shirt formerly worn by Fernando Gago.

Last night's presentation took place on a stage erected on the Bernabeu pitch that also included Madrid's record nine European Cup trophies, a giant screen and with a backdrop of four huge images showing club legends Raul, Juanito, Di Stefano and Zidane.

The former Sao Paulo player, who was named player of the tournament after helping Brazil win the Confederations Cup in South Africa over the last few weeks, said: “Today is a very happy day for me.

“I'm very happy because this new stage of my career will be at Real Madrid. I hope to write my name into the history of this club with many victories and successes.”

Kaka was the first signing confirmed by Madrid after Perez returned to the club presidency at the start of June.

Soon after bringing in the Brazilian, Perez also agreed a world-record £80million fee with Manchester United for Cristiano Ronaldo. That deal was finalised on Friday night and will come into effect from today, with Ronaldo, who like Kaka will be tied to the Spanish giants until 2015, being presented on July 6.

Aside from Kaka and Ronaldo, Madrid also struck a deal to sign Valencia defender Raul Albiol last week for a fee believed to be around £13million, while the likes of Franck Ribery, David Villa and Xabi Alonso are all being linked with moves to the Bernabeu as Perez relaunches the famous ‘galacticos' policy that saw David Beckham, among others, arrive.