This is Carly Rae Jepsen singing "Call Me Maybe."
You probably don't want to watch it. I've heard the song / seen the video only twice, have not been exposed for a week, and yesterday it popped into my head and it won't go away.
If you have not experienced it, you probably should once, just to know what everyone's blathering on about. But the fact that everyone's blathering on about it should be a pretty powerful context clue.
My personal opinion? It's really quite terrible.