Rihanna + Calvin Harris + The Wanted + Pixie Lott + Jason Derulo + Labrinth + Ol

The clothes-allergic Barbadian takes time out of a string of O2 shows to, erm, headline this O2 Xmas bash for Capital FM. She's joined by day-glo synth-popper Harris, the male Saturdays, TW, and teen soul belter Lott amongst others.