Yves the Caterer is an NPC in The Sims: House Party that can be hired for parties or just when the player wants him over to help clean the house, refill food tables and the punch bowl. He charges §350 for his visit, and will leave around midnight, or when the player dismisses him. Anyone can hire him, even children.
When refilling the buffet tables and punch bowls, he does it magically and does the same with emptying them before he leaves. When they are even slightly lower, he'll refill them to maximum. When there is nothing for him to do, he will converse with other party guests.
If he is hired to a house that does not either have a buffet table or punch bowl, he will grumble angrily and fine the player §25 for wasting his time, and then leave. He can simply be rehired later on.
His outfit resembles a chef's outfit, white coat, black and white squared pants with black shoes, and the big white hat. In most language versions, his name is Yves. One could even assume he's Yves Jacquet from Bluewater Village.