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This has to rank up there among a bride's worst nightmares on her wedding day!

Moments after tying the knot to longtime boyfriend Alan Ferguson, it appears as though Solange Knowles broke out into hives on her moneymaker.

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While we don't think she's allergic to marriage -- she looked amazing during her wedding, after all -- Beyonce's sister apparently had an allergic reaction to something in the food at her reception.

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According to TMZ, Solange doesn't know what caused the breakout, but the hives were gone in a "matter of minutes."

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Listen up, ladies, if there is one thing to avoid on your wedding day ... it could be shellfish or any other food you might be allergic too!