The 25-year-old - who looked elegant in a floor-length off-white dress - was de-robed under the camera flashes at the Les Misérables premiere in London.

© WENN / Lia Toby
Showing off her black underwear and braless top half, the singer seemed unaware of exactly how sheer the dress was at the front.

© WENN / Lia Toby
But she wasn't the only one to reveal a lot of flesh as actress Isla Fisher turned heads in a tight-fitting, sculpted, strapless gown with cut-out panels.
Anne Hathaway went for old-school Hollywood glamour in a pearl-studded Givenchy gown.

© WENN
[Isla Fisher]
Co-star Amanda Seyfried stood out in a flamenco-inspired monochrome Valencia dress.
Model Laura Bailey left an impression on the red carpet in a pink Valentino gown, while she also appeared to have forgotten to cover up her top half with underwear.

© PA Images / Ian West/PA Wire
[Amanda Seyfried]
She tweeted: "I don't care if it's not black-tie, or if it's better to be under-dressed... Tonight I am wearing a gown. And diamonds. #lesmis."

© PA Images / Ian West/PA Wire
[Anne Hathaway]
She joined stars Hathaway and Russell Crowe at celebrations well into the night, writing: "After-after-party. Anne Hathaway and Russell Crowe live and acoustic. #lesmis"

© PA Images / Ian West/PA Wire
[Laura Bailey]
Les Misérables premiere:
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