Sims Big Brother 3 is the currently airing third series of the youtube reality show Sims Big Brother, in which 14 housemates, 6 new and 8 returning, entered the house to compete for a grand prize. The series aired its first episode on 6 July 2012 and is due to end later this year when the winner is announced. JD from Sims Big Brother 2 returned to host the brand new series replacing Brian Dowling, who debuted in Teen Sims Big Brother which was later cancelled. JD is therefore the fourth to host the Youtube series.
On Day 1, four housemates from Sims Big Brother, four housemates from Celebrity Sims Big Brother, and six brand new housemates chosen from the audition process entered the brand new Sims Big Brother house. At the end of the launch episode, JD announced that new housemates, noted as 'Gatecrashes', will enter the house during the series in a special episode.
|Charlie||42||Celebrity Sims Big Brother 2||N/A1|
|Emma||22||Celebrity Sims Big Brother 1||Winner|
|Holly||20||Sims Big Brother 1||Evicted|
|Josie||27||Celebrity Sims Big Brother 1||Runner-up|
|Lauzon||30||Sims Big Brother 1||Winner|
|Pedro||23||Sims Big Brother 2||Fifth place|
|Ryan||38||Celebrity Sims Big Brother 2||N/A1|
|Vanessa||29||Sims Big Brother 2||Winner|
1. As the second celebrity series was cancelled, Charlie and Ryan were never evicted.