can you please help me ?

i try to remember the name of a girls/girl band .. don't know for sure. they had a song i liked a lot 1-2years ago. chorus began with "this is the .." and finished with "lucky lucky me" or something like that .. i try to remember it but i really can't !! it was a pop/dance song i think or rap !! ... i know, very little details .. but i really need help !!

i really need to find out the artist and song name