What song is this?? early 00's late 90's?

I haven't heard this song since i was a kid, all i can remember is that it was a pop song, fairly popular at the time, and part (or all) of the music video was in a subway. The singer was female and the audio was always out of sync with the video so it looked like she couldn't lip sync, this is especially noticeable when she steps out of a train and there are dancers around her. Hope you can help i know i didn't give you much to work with.