Indie popster Kate Nash could be heading to the top of the charts this week as her single Foundations is outselling Rihanna's Umbrella.
The Harrow-born musician will release her debut album in August and the cheeky, but addictive Foundations has received a great deal of radio play.
Rihanna has now been at number one for ten weeks with Nash just behind in second place.
Timbaland is also challenging for the top spot with his track The Way I Are getting its physical release this week.
Gennaro Castaldo, from music retailer HMV, said: "Rihanna's ten-week run at the top with Umbrella has, somewhat ironically, coincided with the summer of heavy rains and flooding, so, while it might be a fantastic song, perhaps we might finally be in for some brighter weather."
Rihanna's run at the top has overtaken the most popular track from last year, Crazy, which saw Gnarls Barkley at number one for nine weeks.
Nash's album will be released on August 6th after being brought forward five weeks early to capitalise on her newfound success.
The singer began her musical career with the single Caroline's A Victim, but has turned towards more catchy pop for her new record.