So, it's a male singer. I was in the kitchen/homeware department, so it wasn't "juniors". While I was in the store I made a mental note of a couple lines of the song, but by the time I got home all I could remember was that the singer repeated the word "one" a lot. I'm pretty sure it happened more than once, so it's probably in the chorus. It was like "You're the one one one one one..." etc., except I don't know exactly how many times he said "one" and I don't know what the words preceding "one" were. It could have been I'm the one, You're the only one, You are not the one, etc. The song was kind of pop/alternative ish.
Sorry, I know it's really not a lot to go on. Any help would be greatly appreciated!