Can you tell me what this song is by what the music video is like?

Ok I don't remember anything about the song but I do remember the mmusic video. It was really popular a while ago. It was this one lady and she was really pretty and kept being in these different outfits. She was in a fancy dress in one, pj's, disco, army, and normal wear. For some reason my mind goes to Mariah Carey with the artist but I don't know. Not much to go on I know I'm sorry.