  We present results of the hosts of four high-redshift ($z \approx 2$) and
high luminosity ($M_B \lsim -28$ mag) QSOs, three radio-quiet one radio-loud,
imaged in R and K bands. The extensions to the nuclear unresolved source are
most likely due to the hosts galaxies of these QSOs, with luminosities at
rest-frame 2300\AA of at least 3-7% of the QSO luminosity, and most likely
around 6-18% of the QSO luminosity. Our observations show that, if the
extensions we have detected are indeed galaxies, extraordinary big and luminous
host galaxies are not only a characteristic of radio-loud objects, but of QSOs
as an entire class.

Astrophysics