irish singer new song

[perxplace87]

hey, can anyone help me, im trying to find a song with an irish female singer.
the chorus talks about how she used to sing gloria in exclesis deo, obviously typing that in, i just get lots of classical music.
seen it on mtv2 a couple of times and the video is mainly based around a woman in a park.
im desperate to find this song, its been bugging me for weeks, i hope someone out ther knows what im talking about...
cheers anyway