Péngyoumen dōu juéde tā nánpéngyou zhǎng de hěn yìbān, kě tā búzàihu, zhēnshì qíngrén yǎnlǐ chū Xīshī.
Her friends all think her boyfriend is plain-looking, but she doesn't care. Beauty really is in the eye of the beholder.
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西施 was a legendary beauty of the state of Yue in the Spring and Autumn period, one of the Four Beauties of ancient China (四大美女). A Qing collection of sayings already calls this line a common folk saying.