US star Lady GaGa has claimed her second UK number one single with Poker Face, despite the song entering the chart ten weeks ago.
The New Yorker's hit climbed from fourth to knock last week's number one - Comic Relief single (Barry) Islands in the Stream - off the top spot.
Flo Rida's Right Round remained in second while girlband The Saturdays slipped one place to fourth with their Comic Relief cover of Just Can't Get Enough.
In the album chart, Ronan Keating debuted at number one with new collection Songs For My Mother while Annie Lennox remained in second with The Collection.
U2's new album No Line On The Horizon fell five places from the top of the chart to number six while teenage classical singer Faryl Smith re-entered the top five with her debut album.
The top ten singles in the UK are:
1 Lady GaGa: Poker Face
2 Flo Rida feat. Kesha: Right Round
3 Vanessa Jenkins, Bryn West, Tom Jones and Robin Gibb: (Barry) Islands in the Stream
4 The Saturdays: Just Can't Get Enough
5 Taylor Swift: Love Story
6 TI feat Justin Timberlake: Dead and Gone
7 Kelly Clarkson: My Life Would Suck Without You
8 Akon feat. Offishall/c O'donis: Beautiful
9 Beyonce: Halo
10 Kings Of Leon: Use Somebody
The top ten albums in the UK are:
1 Ronan Keating: Songs For My Mother
2 Annie Lennox: The Collection
3 Kings of Leon: Only By The Night
4 Faryl: Faryl
5 Take That: The Circus
6 U2: No Line On The Horizon
7 Lady GaGa: The Fame
8 Kelly Clarkson: All I Ever Wanted
9 Bette Midler: The Best Bette
10 Lionel Richie: Just Go