Hey I'm looking for this manga where this girl is extremely shallow and cares a lot about appearance. One day she meets this boy (I think it's her fiance or childhood friend). She expected him to be this thin prince like character but he's actually very chubby. However, he's actually very sweet and adorable and loves her very much. If you know this manga, please tell me! Thank you!

Sounds like Mori no Takuma-san

I'm in idol hell T.T