A planet only 13% bigger than Earth was discovered orbiting Alpha Centauri (the closest star system). Problem is that it orbits 10x closer than Mercury and has a surface temperature of about 1200C. Not a good holiday destination.
There may be more planets at Alpha Centauri, but the close-in one is right at the edge of how sensitive the detection system is. There is a new detector going online in 2017 that would be able to detect a Earth-sized planet orbiting at an Earth-like distance. I guess we will see then.