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This year, J.Lo has a new, younger man on her arm and an even newer dress to go with him

The dress code Black Tie Optional indicates that guests can choose whether to wear a traditional Black-Tie ensemble, commonly referred to as a dinner suit or tuxedo, or a stylistically similar outfit known as a Black-Tie Optional ensemble

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Flat espadrilles or low-block-heel sandals work beautifully here, and a long beaded necklace ties the whole look together

This shirt has a slim yet not clingy fit, and it tucks neatly into pants and skirts