Catherine Cruz Gonzaga was born on January 16, 1988, in Taytay, Rizal to Carlito Gonzaga, the incumbent Vice-Mayor of Taytay, and Crisanta Cruz. Gonzaga has an older sister named Toni Gonzaga, also working in the showbiz industry. Gonzaga graduated from the University of Asia and the Pacific with a Master of Arts in Education degree, majoring in Child Development and Education. Gonzaga started her career on ABS-CBN's sitcom, Let's Go where she played the role of Alex, which also became her nickname. She lasted the role until the series fourth season called Gokada Go!. After her departure from the series, she joined the cast of different shows on the same network, such as Pangarap Na Bituin, Your Song and My Girl. She transferred to TV5 and became one of the main hosts of the talk show Juicy!, and also received a lead role on Babaeng Hampaslupa where she played the role of the title character. Further roles on the network include BFGF, P.S. I Love You and Enchanted Garden. Gonzaga returned to ABS-CBN and became the media correspondent on The Voice of the Philippines, where she co-hosts along with her sister. She became another addition to the cast of the gag-show Banana Nite. Gonzaga was then cast two roles on the anthology series Maalaala Mo Kaya, where she played the role of Pinky, which was featured in the episode "Walis"; and Gelyn Tulabing, which was featured in the episode "Wedding Booth".