I still wouldn't know who they are or be able to give a ****
No they wouldn't. She'd still be Taylor Swift and he'd still be Taylor Lautner. There's no rule saying she has to take his name.
and the point is?
is she even seeing him?
Ya. Who doesn't know that.
Well, if Taylor Swift married William Taylor and took a job sewing clothing she would be Taylor Taylor the Tailer !