Welsh soul star Duffy has held off competition in the U.K. albums chart to claim her fourth consecutive week at number one with her album ROCKFERRY. The singer beat Panic At The Disco's Pretty. Odd. and Foal's Antidotes to keep the top spot - both LPs debuted at numbers two and three respectively. Meanwhile, singer/rapper Estelle is enjoying a second week at number one in the singles chart with her Kanye West collaboration American Boy. Rapper Flo-Rida is in second place with Low featuring T-Pain, while Duffy's Mercy is at three and Australian singer Sam Sparro's Black and Gold is at number four. Madonna is also steadily climbing the charts with her single 4 Minutes featuring Justin Timberlake - the song is up two places to number five on digital downloads alone, three weeks before the CD version is released.