Thursday, January 27, 2011 3:33pm ET by  
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Bruno Mars' 'Grenade' explodes on the Billboard Hot 100 chart

Singer-songwriter Bruno Mars has regained his position at the top of the U.S Billboard Hot 100 chart with his second single, 'Grenade'. 

This new success gives Mars his third non consecutive week at number 1 in America with this single, but he slipped down a place to number 2 in the UK midweek singles chart update after losing out to Ke$ha who entered at the top with 'We R Who We R'. 

Britney Spears was last week's number 1 with her comeback single, 'Hold It Against Me', but she has fallen 5 places to number 6. 

Watch Mars performing album track 'Talking To The Moon' at London's Café De Paris from January 24 here: