Lily Allen was left red-faced after flashing her breast onstage at Britain's V Festival on Sunday (18Aug14).

The singer was among the acts closing out the final day of the two-leg event at the site in Chelmsford, England, and she took to the stage wearing a low-cut silver catsuit with no bra.

The racy outfit accidentally unzipped during her performance, and she flashed her nipple to the audience.

Allen also used her set to silence ongoing rumours about trouble in her marriage to Sam Cooper, the father of her two daughters, dedicating a song to her partner and telling the audience, "This song is for my husband, who I'm very much still with - so f**k anyone who says that I'm not."