R&B star Estelle’s current smash ‘American Boy’ begins its second week atop of the Official UK Singles Chart. The song, which also occupies the top spot on the Official Download Chart, fended off competition from Flo’Rida’s ‘Low’ (which sits at #2) and Madonna’s ‘4 Minutes To Save The World (which climbs #7-#5 this week). The Londoner’s new album ‘Shine’, her first release under John Legend’s Homeschool Records, hits stores here in the UK tomorrow.