Who is Pixie Lott? Well, she's a singer and as she was singing at some festival called V, like for Victory or that old TV show about the aliens, I don't know, but her dress came down and...no, we didn't get a nipple slip because she was wearing what looks like Band-Aids over her nipples.
The reporters at something called Yahoo Celebrity have the story (link below), which is sort of a tease to the real story. That being Lily Allen's real nip slip. You know, with a real naked nippled as opposed to a bandage. Still, Pixie is cute and her breasts are nice and we get to see a lot more of them then she intended with her flashy but not as fleshy as it turned out outfit. So, I'm not complaining.
According to the shills at Yahoo, "Still, ever the professional Pixie didn’t let this minor blip put her off her performance and totally distracted from her malfunction with an impressive set." But I'd be more impressed if she showed off her set instead of just a teasingly brief look at her conservative coverups.