Grime artist Tinchy Stryder has made history with his debut chart-topper Number One.
The collaboration with N Dubz is the first song to top the UK singles charts with the words "number one" in the title.
The single is the biggest hit of the Ghanian born vocalist's career after his previous single Take Me Back (feat. Taio Cruz) reached number three.
Flame-haired electro singer La Roux held on to the number two spot with In For The Kill with last week's number one, I'm Not Alone by Calvin Harris, falling to number three.
Lady GaGa held the top spot in the UK album chart with The Fame with 80s legends Depeche Mode grabbing the highest new entry at number two with Sounds of the Universe.
Beyonce climbed four places to number three with I Am... Sasha Fierce and the Noisettes' new LP Wild Young Hearts entered the chart at number eight.
The top ten singles in the UK are: (last week's position)
1 Tinchy Stryder feat. N-Dubz: Number One (-)
2 La Roux: In For The Kill (2)
3 Calvin Harris: I'm Not Alone (1)
4 Lady GaGa: Poker Face (3)
5 Eminem: We Made You (8)
6 AR Rahman & Pussycat Dolls: Jai Ho! (You Are My Destiny (4)
7 Ciara feat. Justin Timberlake: Love Sex Magic (5)
8 Beyoncé: Halo (6)
9 Lily Allen: Not Fair (10)
10 Noisettes: Don't Upset The Rhythm (Go Baby Go) (7)