In pictures: Rupert Grint plays Bogies!

1 of 9 The boys meet up and get ready to play Bogies inside the National Portrait Gallery

2 of 9 Dom kicks off the game with his first Bogie!

3 of 9 They soon warm up and the Comic Relief Bogieometer measures the volume of the bogie shouts

4 of 9 Rupert and Dom struggle to keep a straight face while they try and out bogie each other

5 of 9 Is Rupert losing his nerve? Here he is biting his nails as Dom gets ready to bellow Bogies! again

6 of 9 No - Rupert's in fighting spirit. See the look of determination in his eyes. Dom is looking scared...

7 of 9 Rupert is declared the winner with his final ear-splitting bogie call

8 of 9 According to judges, he scored a massive 5.6 on the scale

9 of 9 Rupert celebrates his win as Dom holds his hands up to defeat