Rihanna has just announced her first major UK arena tour Chart toppers

The R&B singer's track Umbrella is the first song since Wet Wet Wet's Love Is All Around to spend more than nine weeks in pole position.

But its nearest rival, Foundations by Kate Nash, came within 131 sales of knocking Rihanna off the top spot.

Britain's Got Talent winner Paul Potts entered the album chart at number one with his debut release One Chance.

The 36-year-old former mobile phone salesman, who was signed by Simon Cowell after winning the ITV1 show, displaced rock band The Enemy from the top of the charts.

MOST WEEKS AT NUMBER ONE 18 weeks - Frankie Laine, I Believe (1953) 16 weeks - Bryan Adams, (Everything I Do) I Do It For You (1991) 15 weeks - Wet Wet Wet, Love Is All Around (1994) 11 weeks - Slim Whitman, Rose Marie (1955) 10 weeks - David Whitfield, Cara Mia (1954) 10 weeks - Whitney Houston, I Will Always Love You (1992) 10 weeks - Rihanna, Umbrella (2007) Source: Official UK Charts Company

Frankie Laine's I Believe holds the record for the longest run at number one, with 18 weeks on top in 1953.

Rihanna has become only the seventh artist in the history of the chart to score a 10th week at number one.

Umbrella has sold about 354,000 copies since it was first released, according to Music Week magazine.

But that is "pretty low" compared to other long-running chart-topers, according to the magazine's managing editor Paul Williams.

"Any track in the past that would have spent 10 weeks at number one - and there weren't that many - could have expected at this stage to have passed a million sales," he said.

THIS WEEK'S TOP FIVE SINGLES 1. Rihanna, Umbrella 2. Kate Nash (above), Foundations 3. Timbaland, The Way I Are 4. Fergie, Big Girls Don't Cry 5. Enrique Iglesias, Do You Know? Source: Official UK Charts Company

Rihanna's lower total could be put down to changing buying habits in the download age, he said.

"There are more tracks selling now, so sales are spread over many more songs.

"In the days of the physical singles market, most of the sales were focused on the songs in the top 40.

"Now, there are more to choose from, so the biggest sellers these days aren't the same as their equivalents a few years ago."

There was also "a good chance" that Nash would replace Rihanna at number one next Sunday, Mr Williams added.