I read that a wee little human attended a fancy party, as did a small dog.

Dom Pérignon was offered to the attendees.

"A Party in Cannes Announces..."

https://www.nytimes.com/2023/05/25/style/cannes-party-david-zaslav.html

It was made available by some young women in uniforms, according to Violette Franchi's photo. Also, how about Violette Franchi's picture of the staff offering the guests bottles of Dom Pérignon?