In December 2021, Daddario casually announced on Instagram that she and Form were engaged. She wrote, "The absolutely most wonderful man, you handle nonsense, loss, life, difficulty, people, with grace and compassion. You're a loving father, funny, hard-working, honest, introspective, sexy, kind and sensitive- you've made room on some of the prime real-estate wall space for pictures of Levon, a dog you never even met. You've allowed the two knuckleheads (who aren't as good as Levon, shhh) endless space in our home, and I love hearing you from upstairs talking to them when you don't know anyone is listening. You've taken the worst moments of my life and soothed them, just knowing that you existed when they happened makes my heart fuller and more pieced together."
She continued: "Right now I am looking at all the giant packages of gluten-free Oreos you surprised me with. It's so many Oreos, it makes me laugh. I love how we have been chastised and separated by flight attendants on multiple international flights because we are like teenagers. Why does it all feel so different? This is the love they talk about in poems and Ed Sheeran songs. Andrew- you are the greatest, most formidable love of my life. I couldn't be luckier."
Daddario also shared pictures from a photo shoot showing off her engagement ring.
In an interview with People in February 2002, the "Baywatch" actor told the outlet, "It feels so exciting. . . . But mostly it just feels very peaceful. I feel very at peace with him and very happy, and I just feel very lucky."