Ronaldo had to wait a long time to take the penalty - almost three minutes - as it took while to calm everything down.
Gigi Buffon was sent off in what will be his last Champions League match, and Wojciech Szczesny came on to replace him.
He could do nothing though.
It was an emphatic penalty from Ronaldo who put the ball high and out of reach straight into the top corner. Real go on to the semi-finals.
Check it out here:
11 April 2018