Music
The hit, featuring rapper Jay-Z, also leads sales in the USA, Ireland and Australia.
Top 10 changes this week come from risers Avril Lavigne, Timbaland, Natasha Bedingfield and Fergie.
The top ten UK singles in full:
1. (1) Rihanna ft. Jay Z: 'Umbrella'
2. (2) Kate Nash: 'Foundations'
3. (17) Avril Lavigne: 'When You're Gone'
4. (3) Enrique Inglesias: 'Do You Know'
5. (6) Hoosiers: 'Worried About Ray'
6. (18) Timbaland ft. Doe/keri Hilson: 'The Way I Are'
7. (49) Natasha Bedingfield: 'Soulmate'
8. (28) Fergie: 'Big Girls Don't Cry'
9. (5) Lee Mead: 'Any Dream Will Do'
10. (7) Jack Penate: 'Torn On The Platform'
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