Carlos Diego Loyzaga Manhilot (born May 21, 1995) is a Filipino model, actor and video jockey. He is known as one of the members of the male group Kapamilya Cuties.

Loyzaga was born in San Juan, Metro Manila to actress Teresa Loyzaga and actor Cesar Montano. He has a half-brother named Joseph Dizon, from his mother's former marriage to businessman Arnold Dizon; three half-sisters Angelina Cruz, Samantha Cruz, and Francheska Cruz, from his father's second marriage to Sunshine Cruz; and half-siblings named Angela Manhilot and Christian Angelo Manhilot from his father's first wife.

He is a grandson of Filipino basketball legend Carlos Loyzaga and a nephew of actress Bing Loyzaga and of former Philippine Basketball Association (PBA) players Chito Loyzaga and Joey Loyzaga.

Loyzaga confirmed to Aiko Melendez' YouTube vlog that Sofia Andres became his TOTGA, or "the one that got away." "I made a really big mistake. I was a kid. I was 20, 21 years old," he added, adding their breakup in 2018. Sofia and boyfriend, auto racing driver, Daniel Miranda have a daughter named Zoe.

In May 2000, Loyzaga, his mother and half-brother Joseph Dizon moved to Sydney.

Barbie Imperial' breakup with Loyzaga happened in February 2022.

In her January 7, 2024 Instagram post, Suapengco accused Loyzaga of evicting them out of his house because of a new relationship with Cecile Mendoza. "So my baby daddy [Diego Loyzaga] decided to kick me out and his baby out of his house so this girl can come over," she lamented. She surprisingly revealed that he told Toni Gonzaga, of his 2018 drug rehabilitation. His mother Teresa revealed that she sent Diego to a rehabilitation center.

On May 27, 2024, Loyzaga and partner, yoga teacher, Alexis Suapengco, witnessed the baptism and Hailey Paige's first "Star Wars" themed birthday.