Why do celebrities fall for basic looking models?

Models such as Ari Fournier and Hailey Bieber don’t look like anything too special in my opinion. Yet they have both managed to drive their s/o head over heels - Hailey even managing to get married as low as 21. I don’t understand why.
Why do celebrities fall for basic looking models?
Why do celebrities fall for basic looking models?
Why do celebrities fall for basic looking models?
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