"She said yes!!!... I think. I can't really be sure," the 26-year-old captioned a sweet snapshot of the two kissing. "I'm going marry my best friend. @italiaricci."
Amell and the ABC Family Chasing Life star, 27, celebrated their six-year anniversary last month. "Happy 6 year anniversary to my favorite person in the entire world. I love you so much," Ricci wrote via Instagram on July 19. "Also, you're pretty good-looking. @robbieamell."