Beyonce Knowles has scored a second week at the top of the US singles chart with her hit IRREPLACEABLE. The track is also the Hot 100's greatest airplay gainer for a sixth straight week. Akon's I WANNA LOVE YOU stays put at number two for a second week, while his collaboration with Eminem, SMACK THAT, changes places with Fergie's FERGALICIOUS after dropping from three to four. The highest new entry on the new chart belongs to EMINEM and pals 50 Cent and Lloyd Banks - their new track YOU DON'T KNOW debuts at number 12, the highest Hot 100 debut for each artist.