Big Brother will be back on US screens again this summer, broadcast network CBS has confirmed.

Casting has already begun for the sixth season, which will once again run over three months.

"Big Brother 6 has some big surprises that will soon be revealed," said Executive Producer Arnold Shapiro.

"Our goal this summer is to assemble the most colourful, competitive, and charismatic houseguests we've ever had. Right now, we're seeking the most memorable and exciting competitors we can find."