Alex Gonzaga

Catherine Gonzaga, popularly known by her screen name Alex Gonzaga, is the resident houseguest in Pinoy Big Brother: All In.

Prior to the opening night, Alex was initially introduced as a newly added host for the season and was supposed to join her sister Toni Gonzaga as well Bianca Gonzalez, Robi Domingo and John Prats for hosting Pinoy Big Brother and its companion shows.

However, during the live premiere night, Alex was revealed as the 18th and last housemate to be entering the house that night. She was then blindfolded and sent into the Big Brother house, leaving the viewers and especially her sister, Toni Gonzaga shocked.

Since her first entry, her real status was initially declared as a Celebrity Housemate but on Day 7, Big Brother revealed that Alex was just a houseguest and would stay in the house until further notice. Since she was a houseguest, she wasn't allowed to nominate nor be nominated. However, she must participate in the weekly tasks, as well as join in some of the competitions as an additional player.

Inside the house, Alex became the source of laughter to the housemates and viewers. Just like outside, she became notable for her vibrant, sassy and energetic personality. She was known to be very hyper as well as being funny with everything. She was friends with everyone in the house, but her closest was Fifth Pagotan.

On Week 7, Alex was told by Big Brother that she would be leaving the house. On Day 49, the house had a farewell party in the Activity Area for her departure. Afterwards, she finally left the house leaving the housemates crying. She visited the house a week later on Week 8 for Fifth's 100 Seconds Encounter after her friend's coming out as a bisexual.

After she left the house, she was replaced by Cheridel Alejandrino who initially entered as a house guest but later revealed as a Housemate.

Trivia

 * Just like Alex, her older sister Toni Gonzaga, who is the main presenter of the series, also experienced becoming a houseguest when Toni became a surprise houseguest in Pinoy Big Brother: Celebrity Edition 2.
 * Alex became the second longest staying houseguest to live in the Big Brother house, just after Pinoy Big Brother host, Mariel Rodriguez was trapped by Big Brother in Pinoy Big Brother: Celebrity Edition 2.
 * Alex stayed in the house for 49 days while Mariel stayed for 52 days.
 * Despite not being a playing contestant, Alex was officially considered as part of the main cast.
 * She's included in Pinoy Big Brother: All In's official cast photo.