prince charming
US /ˌprɪns ˈtʃɑːr.mɪŋ/
UK /ˌprɪns ˈtʃɑːr.mɪŋ/

1.
a fictional character, typically a prince, who rescues and marries the heroine in a fairy tale.
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Every girl dreams of her Prince Charming.
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She waited for her Prince Charming to sweep her off her feet.