POP princess Katy Perry has leapt to the top of the charts with her latest single.

The American scored her fourth UK No 1 with power pop record Roar, after selling 179,500 copies in the last seven days.

Perry ended Ellie Goulding's three-week reign at the top of the singles chart with Burn.

The original Sugababes Siobhan Donaghy, Mutya Buena and Keisha Buchanan failed to make the top 40 with come-back single Flatline.