British pop star Pixie Lott was so mortified by a revealing paparazzi shot of her breasts, she now gives all her outfits a "flash test" to make sure they don't go see-through.

Last month (Jul14), the Mama Do hitmaker was snapped on a night out in London wearing a top which had become transparent in the glare of the photographer's flashbulbs and showed off her bare boobs.

Lott reveals she was deeply embarrassed by the picture, and now tests all her outfits at home before she goes out.

She tells Britain's Fabulous magazine, "I do a flash test on my phone before I go out... I (previously) went out in Soho with my friends and when I was snapped by photographers, my top went see-through. I was just so embarrassed because I didn't intend for that (to happen). I thought people might have thought I did that on purpose, but I actually didn't. I just have to be more careful."