[Photo credits to TheSun.co.uk]
A staggering 80,000 fans crammed into the Bernabeu to welcome the Portuguese winger following his world-record £80million move from Manchester United.
But the ceremony was abandoned when Ronaldo had to be whisked away as dozens of supporters ran on to the pitch.
Real's security guards frantically tried to contain the invaders and there was panic for a few seconds.
Ronaldo, 24, was expected back on the stage before leaving with Real supremo Florentino Perez and honorary president Alfredo di Stefano.
Instead he was taken away by scared guards, who decided not to take any risks as fans ran amok on the pitch and scuffles broke out with security staff.
Ronaldo said: "To see so many people here for my presentation was very emotional.
"I felt the love of the people. I am ambitious and I want to adapt as quickly as possible to give my best."
In 1984, 70,000 fans turned up at Napoli to welcome Diego Maradona while 50,000 saw Kaka unveiled by Real last week.