Katy Perry still boasts a heap of sing-your-heart-out pop gems under her belt, from Firework to Roar. The headliner will return to the Jingle Bell Ball stage this year after topping the bill back ...

Meanwhile, Becky will take the 02 by storm with her plethora of chart-topping dance tracks, including Lose Control and My Heart Goes. While Hip-Hop sensation returns to the Jingle Bell Ball ...