Rapper MIMS has scored a second week at number one on the US pop chart after shooting up the countdown from 32 to number one last week (01MAR07). Mims' THIS IS WHY I'M HOT is holding off a challenge from Senegalese R+B sensation Akon, who scores a second week at number two with DON'T MATTER. Akon also features on the new number three hit, Gwen Stefani's THE SWEET ESCAPE. Meanwhile, Avril Lavigne has stunned chart watchers by crashing in at number five with new hit GIRLFRIEND - the week's highest debut. The punky pop anthem, which sold a staggering 122,000 downloads in its first week on release, is the Canadian star's best career debut on the Hot 100. Meanwhile, Fergie has learned how important iTunes downloads are to chart success - her new single GLAMOROUS dropped from number nine to number 33 to number 55 after it was removed from iTunes. The track shoots back up to number eight on the new Billboard chart after it was added to the download website store.