|Pinoy Big Brother: Double Up|
|Season Run||October 24, 2009 - February 13, 2010|
|Host|| Toni Gonzaga|
Paul Jake Castillo
|Previous Season||Pinoy Big Brother: Teen Edition Plus|
|Next Season||Pinoy Big Brother: Teen Clash 2010|
Pinoy Big Brother: Double Up was the third regular season and the seventh series overall of Pinoy Big Brother, which began on October 4, 2009 on ABS-CBN. Toni Gonzaga, Mariel Rodriguez, and Bianca Gonzalez reprised their hosting duties this season. It ran for 133 days until February 13, 2010, which broke Season 2's record for the longest stay of housemates inside the house by only one week.
Melisa Cantiveros emerged as the winner of this season.
- Double Up: For the first time in Pinoy Big Brother history, there will be two similar fully furnished houses with two separate groups of housemates living on each house.
- Double-Up Housemates: Two sets of identical twins were included in the roster of housemates - with each member of the twins living in both parts of the house, switching between the two areas when instructed. However, the rest of the housemates do not know about the twins, or the fact that there are two houses. The twins will also receive immunity from nomination for eviction during the first nomination night if they succeed in keeping this a secret, but if they do reveal it they will be forcibly evicted.
- House Swaps: Housemates are made to swap houses and group members as instructed by Big Brother. Bagyong Walay - Big Brother instructed female housemates from Houses A and B to swap houses. Big Brother Swap - Carrying on from the second regular season, a Filipino housemate would temporarily trade places with a housemate from another active Big Brother season abroad.
- Bagyong Isa: Housemates from both houses will be staying in one house. 14 housemates should survive Vote To Evict in order for them to stay in one house.
- Vote To Evict: The public has given the power to vote to evict a housemate. The housemate with the highest votes will be evicted at the end of the week.
- SE Voting System : The public votes to save or evict a housemate. Housemate with the lowest net votes, save and evict votes combined, is evicted.
- Head of Household and Hand Grenade: The Head of Household twist is once again used with the Hand Grenade as the new addition. Both were implemented after the housemates began living in one house. The Hand Grenade goes to the ultimate loser in the HOH competition.
- Char-Char Change: Big Brother made a fake announcement that public voting is discontinued and the housemates themselves will vote among the nominees for who should be evicted, but the ultimate fate will still be decided by the public. Big Brother used this system to show each housemate's true feelings toward their fellow housemates. The name of the twist is a play on Charter change and "Char-Char," which is Filipino slang for "false."
- Resbak Attack: On Day 105 (January 16, 2010), after Cathy's eviction, the show announced a new twist involving ex-housemates re-entering House B to compete with the remaining housemates. Cathy, the latest evictee, was instructed by Big Brother to move to House B instead of formally exiting the Pinoy Big Brother House. Princess, Delio, Tom, Rob, Yuri, Patrick and Rica joined Cathy at House B. Tom later voluntary exited and was replaced by Kenny. These eight ex-housemates competed with the remaining eight housemates with the pot money of the Big Four at stake. From the name itself, the ex-housemates had the task of seeking revenge on the remaining eight housemates. The word Resbak is a Filipino slang for revenge
- House Players: Evicted or Former housemate/s will return to the house to test the remaining official housemates through tasks set by Big Brother and the audience.
- The Big Jump to the Big Night: The seven remaining housemates will undergo a series of challenges. The overall winner will be granted permanent immunity from nominations and automatic inclusion into the Big Night.
- The White Room: Two of the six remaining housemates would undergo an endurance challenge in a purely white room for a chance to win a brand-new house and lot. A housemate would lose the challenge if he or she pressed a red button somewhere in the room.
- Big Five - Big Brother decided to put five housemates in contention for the Big Winner title instead of the standard four; the "Fifth Big Placer" would get PHP100,000 as his prize and the same amount for his chosen charity. Big Reveal - For the first time in the franchise's history, the actual ranking of the finalists were revealed to the public before the Big Night. This happened on Day 129.
With the Double-up twist of having two houses, the houses have a European motif for interiors with bright colors as inspired by architectural designs of Antoni Gaudí for House A and Vincent Van Gogh's paintings for House B. The houses appear to be smaller than before, with each house having the same set of amenities with different wall paintings. House A has predominantly blue and green wall paintings. House B has predominantly red and yellow wall paintings. Furthermore, House A's garden inherits the infinity pool previously seen in Teen Edition: Plus and the second season of Pinoy Dream Academy; House B only has a simple terrace area with a jacuzzi at one side.
The Big Swap
|Civilian||1 · 2 · 3 · 4|
|Combined||5 · 6 · 7|
|Celebrity||1 · 2|
|Teen||1 · 2 · 3 · 4|
|Big Brother Seasons|