The "Lights" singer brought her style A-game to the "Les Miserables" premiere in London on Wednesday night in a flowing gown with sheer sleeves and buttons. But the camera flashes illuminated more than the 25-year-old probably wanted to show, revealing her underwear and her, well, lack of a bra.

But it's okay, Ellie. The intrusive camera flash has its share of victims, at least you stilldidn't have the most controversial look of the night. (*side-eye to Anne Hathaway.*)

Slightly NSFW Photos: