Johnson was previously involved in long-term relationships with her childhood sweetheart, musician Noah Gersh, and actor Jordan Masterson.
She dated Matthew Hitt, the lead vocalist of Welsh indie rock band Drowners, intermittently for almost two years until 2016. Johnson has been in a relationship with Coldplay’s vocalist Chris Martin since October 2017.
They reside in Malibu, California. Johnson is a tattoo enthusiast and has been named a brand ambassador for the luxury fashion brand Gucci. In 2023, she appeared in an advertisement campaign for Gucci promoting their leather handbags.
