Ronaldo scored twice at the National Stadium of Wales, to help his side become the first defending champions to retain the title in 27 years.
They also clinched their first La Liga and Champions League double since 1958.
“I had a spectacular end to the season. I prepared for that because things are won at the end of the season,” Ronaldo said.
“It was a good choice by the coach and I’m very happy.
“We are a very good team and in the second-half we showed how good we are.
“I’m delighted. I’m top scorer in the Champions League again. It’s been a brilliant season.”
Ronaldo has now won 20 major trophies in his glittering career, with four Champions League triumphs including one at Manchester United.