Well, of course - a fancy, upscale party like this needs food to match! Here, let me serve you a plate.

[He's going to go about doing just that; picking out food that he thinks Dipper would like best. Which means mostly sweets or salty foods, of course - what else would a twelve year old like?]

You look rather dapper, by the way! You and your sister match on purpose, right?
It's absolutely adorable!