你是心里最美丽的存在
[nĭ shì xīn lĭ zuì mĕi lì de cún zài]
'你是心里最美丽的存在 (Nǐ shì xīnli zuì měilì de cúnzài)' simply put means you're seen as beautiful from the heart - this could either reflect personal admiration towards a certain individual or express inner beauty over physical features.