The appropriately-named Number One by Tinchy Stryder and N-Dubz is the top-selling UK single for the third week running.
The single - the first-ever UK number one to actually be named Number One according to the Official Charts Company - beat off competition from La Roux's In For the Kill, which stayed at number two.
In the albums chart, Bob Dylan is still at the top with Together Through Life, which made history last week when it got to number one - 29 years after his last top-selling UK album, New Morning.
Top ten selling UK singles (source: Official Charts Company)
1 Tinchy Stryder featuring N-Dubz - Number One (1)
2 La Roux - In For the Kill (2)
3 Ironik, Chipmunk and Elton John - Tiny Dancer (Hold Me Closer) (3)
4 Calvis Harris - I'm Not Alone (4)
5 Lada GaGa - Poker Face (5)
6 Ciara featuring Justin Timberlake - Love Sex Magic (6)
7 Eminem - We Made You (8)
8 Lily Allen - Not Fair (9)
9 AR Rahman featuring Pussycat Dollls - Jai Ho (7)
10 Beyonce - Halo (10)
Top five selling UK albums
1 Bob Dylan - Together Through Life (1)
2 Lada GaGa - The Fame (3)
3 Lily Allen - It's Not Me It's You (5)
4 Pink - Funhouse (6)
5 Beyonce - I Am Sasha Force (4)