The star's cover of Keane's 'Somewhere Only We Know' remains at the top of the chart, while One Direction's 'Story Of My Life' bounces back up from six to two.
Hozier are at three with 'Take Me To Church', Eminem and Rihanna are at four with 'The Monster' and Calvin Harris, Alesso and Hurts are the highest new entry at five with 'Under Control'.
Pitbull and Ke$ha continue to climb with 'Timber' up to number 12, while McFly land at 20 with new single 'Love Is On The Radio'.
One Direction's Midnight Memories album cut 'Strong' lands at 21 following its digital release, while Justin Bieber is at 31 with his latest #MusicMondays offering 'Roller Coaster'.
Further down, Mary J Blige and Jessie J's 'Do You Hear What I Hear?' is at 40 and Olly Murs is at 50 with 'Hand On Heart'.
This week's Irish Top 10 is as follows (click where possible for our reviews):
1. (1) Lily Allen: 'Somewhere Only We Know'
2. (6) One Direction: 'Story Of My Life'
3. (4) Hozier: 'Take Me To Church'
4. (5) Eminem ft. Rihanna: 'The Monster'
5. (-) Clavin Harris & Alesso ft. Hurts: 'Under Control'
6. (14) Bastille: 'Of The Night'
7. (7) Martin Garrix: 'Animals'
8. (8) Gary Barlow: 'Let Me Go'
9. (-) Original Rudeboys: 'Never Gonna Walk Away'
10. (9) Lorde: 'Royals'
Watch the John Lewis advert featuring Lily Allen's 'Somewhere Only We Know' below: