Cristiano Ronaldo takes football extremely seriously but that doesn't mean he can't have a laugh at training and take part in fun challenges. The latest craze involves you having a huge bucket of freezing water poured over your head and then you can nominate three other unlucky peers. 

Ex-Manchester United team-mate Darren Fletcher nominated Ronny and here is the challenge:

Ronaldo has challenged three celebrities to do the bucket prank next. The Real Madrid man has called out Lil Wayne, Beyonce and Jennifer Lopez to be the latest victims.

Check out all the other athletes that have taken part in the bucket challenge.