Her actor fiancé also shared the photograph alongside the touching words: "When you wake in the morning I will kiss your face with a smile no one has ever seen."
"When you wake in the morning I will kiss your eyes and say it's you I have loved all these years."
It's certainly a joyous time for the couple, as they also revealed that they are expecting their first child together last September.
"We are beyond overjoyed and couldn't be happier to be expanding our family!" the soon-to-be-newlyweds told People magazine.
The duo first began dating in October 2018 following Dewan's split from Channing Tatum after nine years of marriage.
The former couple share six-year-old Everly Tatum together.
But Tatum has moved on too, as the actor is currently dating British singer Jessie J.