No one can end Alicia Keys' run at the top of the U.S. pop charts - the R+B star has just claimed a third week at number one. The singer's No One has held off a charge from Kiss Kiss by Chris Brown, which jumps up a spot to two on the new Billboard countdown. Britney Spears scores the fastest growing digital song with Piece Of Me, which jumps up from 63 to 47 and another Chris Brown track, With You, is the top debut at number 72. Snoop Dogg's Sensual Seduction debuts at 76, extending the rapper's streak of having at least one song chart per year to 10.