It was announced on November 13 , 2015 on the official website .
Big Brother All Stars 2015 was the fourth season of the all - star spin - off of Big Brother and the seventeenth season of the format in Bulgaria overall .
Big Brother All Stars was announced on November 13 , 2015 on the official website .
Big Brother All Stars 2015 was the fourth season of the all - star spin - off of Big Brother and the seventeenth season of the format in Bulgaria overall .