Today, astronomers have announced that Proxima Centauri has a planet, which would of course be the closest exo-planet to our solar system. It orbits the star every 11 Earth days, and lies within the "Goldilocks zone", in which liquid water may exist. The planet has a mass about 1.3 times that of Earth. Whether is has an atmosphere or even a solid surface has not been determined.
Read more at European Southern Observatory, Scientific American, Discover and Universe Today; and watch this video from Science News:
Astronomers discovered the planet using ESO's telescopes.