Bruno Mars has exploded Britney Spears' return to the top of the U.S. pop charts - his GRENADE is back at number one.
The singer scores a third non-consecutive week at the top of the charts. Spears' Hold It Against Me drops to six.
Katy Perry's former chart-topper Firework jumps up a spot to two on the new Billboard Hot 100, while Wiz Khalifa's Black and Yellow rounds out the top three.