The actor took the stage to thank the award but the artist Rita Ora approached him and took of his shirt.
The actor started laughing and took off his shirt in front of the audience who kept shouting and applauding.
As recalled, the actor 26 years promised in his Twitter account remove the shirt on stage if he won in that category.
"If I win Thor, will accept the award on stage shirtless," wrote then, Zac Efron.
