she never told him her name, he assumed Aria was Mielle since he saw the Roscente's family crest on the carriage Aria was riding.
And since he didn't thought of Aria as 'Aria' because of the rumours of her spoilt-brat attitude that spread around before she changed.
Our crown prince just loves to assume things hahahahaha
╮(￣▽￣)╭
ooh , yeah you are right . thank God he will know the truth by embarrassing himself
I saw the raws and for me it was hilarious at how embarrassed he was. And most definitely fangirling when he wanted to look for Aria (≧∀≦)
I thought that he was actually gonna make fun of mielle then I remembered that she told the prince that her name is mielle... idc though , our fl got a crown prince twisted around her finger