Camila, 25, posted an Instagram snap of her kissing Charles, 28, in front of a sunset backdrop.
"365 days. i love you," she captioned the sexy pic.
Charles returned the favor by posting a photo of them cuddled up on a boat with the caption "I love you."
Their Riverdale costar Lili Reinhart and many others left supportive words about their anniversary in the comments section.
Camila called Charles a "hopeless romantic" on the red carpet of his film A Sun Is Also a Star in May 2019.
“He does write me love letters.” she told Entertainment Tonight. "It’s just the simple things, you can just say something like ‘I’m thinking about you," Charles further explained about his sweet gesture.
Are you a fan of Camila and Charles as a couple? Sound off in the comments!