The list is based with the most top10 singles.

Britney is ranked second for the most successful female acts of the 21st century in UK but first for the most successful female artists of the 21st century in the UK.

The top 10

1. Sugababes
2. Britney Spears
3. Pink
4. Anastacia
5. Madonna
6. Kylie Minogue
7. Girls Aloud
8. Missy Elliot
9. Atomic Kitten
10. Christina Aguilera

http://www.sugababes.com/

wouldn't Madonna be number 1 ? didn't she like have the most hits of the 21st cnetury over there I heard American life even did well over there

Only young teens buy singles anymore, hence why Sugababes are at number one and Madonna is at number 5. It would be totally different if it was based on albums.

Cool, britney at 2º

But look Sugababes are english so...they have more sucess than other singers!

That's great, thanks for posting!

1. Sugababes (16 hits)
2. Britney Spears (14 hits)
3. Pink (14 hits)
4. Anastacia (13 hits)
5. Madonna (12 hits)
6. Kylie Minogue (12 hits)
7. Girls Aloud (12 hits)
8. Missy Elliot (12 hits)
9. Atomic Kitten (11 hits)
10. Christina Aguilera (10 hits)

OMG @ Sugababes, Missy E. & Pink!

Great to see Britney at n2.

I didn't realise the Sugarbabes were that popular, but it's nice to see a UK act on top of a UK list and fair play to the rest.

lol are you kidding me? Sugababes are like famous in Asia and Europe. I Dont Know About America, Seems Like only 4 out of 10 People know them.

that chart will change soon hopefully with the release of pink s next singles off I'm Not Dead