Performing in Wellington, New Zealand, the star danced and sang a selection of her hits, embarrassingly unaware the zip was down in her tight white trousers.
Teamed with a white waistcoat, Fergie showed off her toned physique and would have looked her usual groomed self if it wasn't for the noticeable trouser disaster.
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Fergie performs in New Zealand last night with her trouser zip undone
Caught short: Fergie wets herself on stage in San Diego
The incident isn't the first time the singer has embarrassed herself on stage - in 2005 she famously wet herself during a gig in San Diego.
Let's hope the recent-engaged star pays more attention to the outfit she will don for her forthcoming wedding.
Actor Josh Duhamel, 35, proposed to the 32-year-old during a break in Mexico.
The pair who have been dating for three years already share a multi-million dollar house together in Los Angeles.
Fergie's gaping zip was evident to everyone but the singer herself
The usually groomed singer carried on with her performance before going offstage to correct the wardrobe malfunction
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