Hollywood has been trying to scare us with inbred red-necks, diverting attention away from the real threat: inbred royals.
What is the closest star? Trivially, it's the Sun. Non-trivially, it's Alpha Centauri C (aka Proxima Centauri).
That not what Q asked, though.
Q#376: >How far away is the closest star?
That's Proxima Centauri at 4.2 light-tears.