NASA’s Kepler space telescope increased its catalogue in 2016 by an additional 1,284 worlds — the greatest number of planets ever announced at a single time.  It brings Kepler’s confirmed planetary haul to more than 2,000 exoplanets.  The nearest is 4.2 light years away – in other words, around our nearest star, Proxima Centauri.
Proxima Centauri is one of the 3 stars that make up Alpha Centauri, it’s a dwarf, but the new planet Proxima Centauri b (roughly the same size as Earth) is very close to it.  In fact it orbits every 11 days.  So it appears to lie in a putative “habitable zone”.