If you still don't know who she is, a primer can be found here. Taylor's Impact is here.
Her EP is a digital download and out on Friday. But the songs are here!
Since the Fallon performance won't embed, it can be found here or here.
But enjoy her being cute here:
Tweet. Video 1. 2. 3. 4. 5. Alternate Video 5. Video 6.
You still get to keep Bieber, you're welcome 'Murrica!