Hip-hop star SOULJA BOY has claimed a fourth non-consecutive week at the top of the U.S. pop charts with his CRANK THAT hit as Britney Spears challenges for number one. Soulja Boy was knocked off the top of the charts for one week by Kanye West, but reclaimed the top spot two weeks ago. But his four-week reign at the top of the Billboard countdown is under attack from Spears, whose comeback hit Gimme More screams up the charts from 68 to number three - thanks to 179,000 downloads. The single marks Spears' first top 10 hit since Toxic in 2004. Kanye West's Stronger separates Spears and Soulja Boy on the new chart. American Idol winner Jordin Sparks scores the chart's highest new entry - her Tattoo debuts at number 58.