Beyonce will gain from the pain

Beyonce at the British premiere of Dreamgirls

Beyonce brought a touch of sparkle to the British premiere of Dreamgirls in a shimmering sequinned dress by designer Elie Saab.

Temperatures in Leicester Square were near zero, but the 25-year-old - braving the cold in her strapless gown - said: "I'm not wearing it for long and it's worth the pain." .

Beyonce lost more than 6kg in 10 days for the role after going on a diet of maple syrup mixed with lemon juice and water.