The track, which features US rapper Pitbull, is Burke's third Irish number one as she has previously reached the chart summit with 'Hallelujah' in 2008 and 'Bad Boys' last year.
Plan B climbs up seven spots to second place this week with 'She Said', while Train slip to third with last week's chart-topper 'Hey, Soul Sister'. Usher's 'OMG' and Jason Derulo's 'Ridin' Solo' take the remaining positions in the top five.
The highest new entries this week are B.o.B's 'Nothin' On You' at seven and New Sunset Hotel's 'The Bitter End' at ten.
The top ten singles in full (click where possible for our reviews):
1. (4) Alexandra Burke ft. Pitbull: 'All Night Long'
2. (9) Plan B: 'She Said'
3. (1) Train: 'Hey, Soul Sister'
4. (2) Usher ft. will.i.am: 'OMG'
5. (5) Jason Derulo: 'Ridin' Solo'
6. (17) Edward Maya & Vika Jigulina: 'Stereo Love'
7. (-) B.o.B. ft. Bruno Mars: 'Nothin' On You'
8. (39) Glee Cast: 'Jessie's Girl'
9. (6) Lady Antebellum: 'Need You Now'
10. (-) New Sunset Hotel: 'The Bitter End'