Big Brother 2011 or better known as Veliki brat 4 (or short VB4) was the fourth series of the Serbian production of the Big Brother reality television series Veliki brat. This series was the first that features housemates from Croatia, and therefore sets the record number of participating countries to 5. Other countries that take part in it, besides Serbia are Montenegro, Bosnia and Herzegovina and Republic of Macedonia.

 

The program is known as the sixth season of Big Brother in Croatia due to a former Big Brother series that aired for five seasons independently of Veliki Brat.

The show started on March 13, 2011, marking the first time that the regular series is broadcast on Pink TV.

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For the first time producers completely changed the design of the eye logo. This season uses 2010 UK Big Brother logo - an eye drawn out of flowers and petals, but slightly different coloured. The opening credits were changed as well; the music stayed the same, but the intro is the one used in 2010 British series, although slightly altered.

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The Croatian logo has remained the same as in previous seasons, it has been redesigned a bit
The winner is Croatian housewife, Marijana Čvrljak. This is the first Croatian season of Big Brother that won a female.